# 🛠 Developer Tools **URL:** https://forum.flow.com/c/developer-tools/11.md?page=1 [Latest](https://forum.flow.com/latest.md) · [Categories](https://forum.flow.com/categories.md) · [Tags](https://forum.flow.com/tags.md) **Page:** 2 --- ## [Playground Keeps Crashing - Graph Errors](https://forum.flow.com/t/playground-keeps-crashing-graph-errors/2527)
**Author:** [@seeward](https://forum.flow.com/u/seeward)\ **Replies:** 5\ **Last updated:** [December 6, 2021, 6:40am UTC](https://forum.flow.com/t/playground-keeps-crashing-graph-errors/2527 "2021-12-06T06:40:14Z")
I am not able to deploy the (unedited example) contracts or execute transactions int the playground. I get the above error or a completely white screen. Could this be just for me? --- ## [Log() does not print anything in emulator](https://forum.flow.com/t/log-does-not-print-anything-in-emulator/2244)
**Author:** [@Amin](https://forum.flow.com/u/Amin)\ **Replies:** 3\ **Last updated:** [November 26, 2021, 12:43am UTC](https://forum.flow.com/t/log-does-not-print-anything-in-emulator/2244 "2021-11-26T00:43:17Z")
I was trying to test out moving tokens between accounts, very ad-hoc and basic stuff on emulator network to get the hang of the language. When it came time to check for my account’s Vault Balance, I wrote a short script … --- ## [Extension is not able to read the flow.json file](https://forum.flow.com/t/extension-is-not-able-to-read-the-flow-json-file/2546)
**Author:** [@woa](https://forum.flow.com/u/woa)\ **Replies:** 0\ **Last updated:** [November 23, 2021, 7:46pm UTC](https://forum.flow.com/t/extension-is-not-able-to-read-the-flow-json-file/2546 "2021-11-23T19:46:01Z")
Whenever I try to run commands from the extension, it throws this error: The issue seems to be that the extension is prefixing the file path with a “/”. I have run “flow init” and I do have a flow.json file Windows… --- ## [Building the FCL](https://forum.flow.com/t/building-the-fcl/2512)
**Author:** [@hier07](https://forum.flow.com/u/hier07)\ **Replies:** 5\ **Last updated:** [November 16, 2021, 11:09pm UTC](https://forum.flow.com/t/building-the-fcl/2512 "2021-11-16T23:09:51Z")
Are there docs/examples of building the FCL for distribution? We do not use REACT in our project, so we’re looking for an alternative to the kitty-items demo that uses cra and “react-script build.” Anything using Webpa… --- ## [Can't run the flow dapp made from dappstarter.com on my local system](https://forum.flow.com/t/cant-run-the-flow-dapp-made-from-dappstarter-com-on-my-local-system/2510)
**Author:** [@luckywithu](https://forum.flow.com/u/luckywithu)\ **Replies:** 1\ **Last updated:** [November 10, 2021, 3:14pm UTC](https://forum.flow.com/t/cant-run-the-flow-dapp-made-from-dappstarter-com-on-my-local-system/2510 "2021-11-10T15:14:43Z")
Hello. I think dappstater is an awesome tool for the flow dapp developer. But I have some issues in using the dappstarter. I’ll appreciate it if you confirm my issue and provide me a great solution. I created my flow… --- ## [Is emulator running on a newer version than Testnet?](https://forum.flow.com/t/is-emulator-running-on-a-newer-version-than-testnet/2516)
**Author:** [@Fou](https://forum.flow.com/u/Fou)\ **Replies:** 1\ **Last updated:** [November 9, 2021, 4:15pm UTC](https://forum.flow.com/t/is-emulator-running-on-a-newer-version-than-testnet/2516 "2021-11-09T16:15:31Z")
Hi all, I’m running into a weird issue, my code works just fine in emulator, but it throws some errors after deploying to testnet, so I’m wondering if it could be that my emulator is running on a newer version than test… --- ## [Balance in account and FlowToken](https://forum.flow.com/t/balance-in-account-and-flowtoken/2500)
**Author:** [@bevis](https://forum.flow.com/u/bevis)\ **Replies:** 0\ **Last updated:** [November 1, 2021, 6:02am UTC](https://forum.flow.com/t/balance-in-account-and-flowtoken/2500 "2021-11-01T06:02:09Z")
Hi there , I am new to Flow , thanks anyone can help. I want to know the difference between account.balance and FlowToken.Vault{FungibleToken.Balance}. I got account.balance by execute command in Flow cli is different… --- ## [Flow cli against emulator responses in 30 secs](https://forum.flow.com/t/flow-cli-against-emulator-responses-in-30-secs/2487)
**Author:** [@paulm](https://forum.flow.com/u/paulm)\ **Replies:** 1\ **Last updated:** [October 26, 2021, 6:23pm UTC](https://forum.flow.com/t/flow-cli-against-emulator-responses-in-30-secs/2487 "2021-10-26T18:23:53Z")
Hello, maybe is a rookie question. why the flow cli against emulator responses in 30 seconds? Is this a limitation of the emulator? I understand the limitation for security proposes but is not too good to try automati… --- ## [Signing and Verifying Arbitrary Data](https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440)
**Author:** [@PhamTinh](https://forum.flow.com/u/PhamTinh)\ **Replies:** 1\ **Last updated:** [October 12, 2021, 7:56pm UTC](https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440 "2021-10-12T19:56:12Z")
I tired authentication user by blockto. i have done the signing successfully but on the verify step serve seems the problem as far as i see is cros https://testnet-faucet.onflow.org/fund-account/flow.access.AccessAPI/Ge… --- ## [404 @ Flow App Quickstart](https://forum.flow.com/t/404-flow-app-quickstart/2411)
**Author:** [@inztitut](https://forum.flow.com/u/inztitut)\ **Replies:** 0\ **Last updated:** [September 23, 2021, 9:36am UTC](https://forum.flow.com/t/404-flow-app-quickstart/2411 "2021-09-23T09:36:01Z")
Maybe you haven’t noticed… Flow App Quickstart Page Not Found. :eyes: --- ## [gRPC Issues for GetAccountAtBlockHeight](https://forum.flow.com/t/grpc-issues-for-getaccountatblockheight/2407)
**Author:** [@sawru](https://forum.flow.com/u/sawru)\ **Replies:** 0\ **Last updated:** [September 21, 2021, 7:46pm UTC](https://forum.flow.com/t/grpc-issues-for-getaccountatblockheight/2407 "2021-09-21T19:46:39Z")
Another gRPC error unknown is on my end or server-side: GetAccountAtBlockHeightRequest addressReq1 = new GetAccountAtBlockHeightRequest { Address = ByteString.CopyFrom(HexStringToByteArray("0… --- ## [gRPC Issues GetExecutionResultForBlockID](https://forum.flow.com/t/grpc-issues-getexecutionresultforblockid/2405)
**Author:** [@sawru](https://forum.flow.com/u/sawru)\ **Replies:** 0\ **Last updated:** [September 21, 2021, 7:44pm UTC](https://forum.flow.com/t/grpc-issues-getexecutionresultforblockid/2405 "2021-09-21T19:44:12Z")
Hello! I have a query to the gRPC server that I’d be curious is an issue on my end or the server’s. Looking at using this method: GetExecutionResultForBlockIDRequest exeResult = new GetExecutionResultForBlockIDRequest(… --- ## [Problem authenticating fcl transaction](https://forum.flow.com/t/problem-authenticating-fcl-transaction/2309)
**Author:** [@zach8302](https://forum.flow.com/u/zach8302)\ **Replies:** 4\ **Last updated:** [September 17, 2021, 12:41pm UTC](https://forum.flow.com/t/problem-authenticating-fcl-transaction/2309 "2021-09-17T12:41:59Z")
I am attempting to sign a transaction that initializes a user’s account on my next.js site. fcl.transactionTRANSACTION, fcl.args(\[fcl.arg(user.addr, t.Address)\]), fcl.proposer(fcl.authz), fcl.payer(fcl.authz), fcl.a… --- ## [Problem with creating reference to a resource](https://forum.flow.com/t/problem-with-creating-reference-to-a-resource/2348)
**Author:** [@YBBlockDev](https://forum.flow.com/u/YBBlockDev)\ **Replies:** 7\ **Last updated:** [September 14, 2021, 3:59am UTC](https://forum.flow.com/t/problem-with-creating-reference-to-a-resource/2348 "2021-09-14T03:59:14Z")
Hi everyone! I’m new to Cadence and I’m facing a problem with resources & references. I have a resource for certain withdrawing restrictions store in /storage/Restrictions, then I have a transaction that changes the Wit… --- ## [Getting gRPC requires http/2 When Browsing Kitty-Items Web Frontend](https://forum.flow.com/t/getting-grpc-requires-http-2-when-browsing-kitty-items-web-frontend/2292)
**Author:** [@bp\_onflow](https://forum.flow.com/u/bp_onflow)\ **Replies:** 2\ **Last updated:** [August 18, 2021, 9:23pm UTC](https://forum.flow.com/t/getting-grpc-requires-http-2-when-browsing-kitty-items-web-frontend/2292 "2021-08-18T21:23:03Z")
Hi, I am getting “grpc require http/2” error in Chrome when browsing: localhost:8080. No clue why this is happening and what does it mean. My browser for sure supports http2. Here is the launch log for my kitty-items w… --- ## [Send Transaction with multiple args By using Flow CLI](https://forum.flow.com/t/send-transaction-with-multiple-args-by-using-flow-cli/2098)
**Author:** [@aledrfew](https://forum.flow.com/u/aledrfew)\ **Replies:** 3\ **Last updated:** [July 15, 2021, 2:36pm UTC](https://forum.flow.com/t/send-transaction-with-multiple-args-by-using-flow-cli/2098 "2021-07-15T14:36:23Z")
I just want to Transfer Flow from service account (emulator network) to other account, copy the cdc file in flow-go-sdk. The question is how to use the json-cadence file which includes more than one argument? I type like… --- ## [Flow CLI - error: authorizer count mismatch for transaction](https://forum.flow.com/t/flow-cli-error-authorizer-count-mismatch-for-transaction/2166)
**Author:** [@Joker478](https://forum.flow.com/u/Joker478)\ **Replies:** 2\ **Last updated:** [July 8, 2021, 7:44am UTC](https://forum.flow.com/t/flow-cli-error-authorizer-count-mismatch-for-transaction/2166 "2021-07-08T07:44:49Z")
Hello, I am using some parts of flow-py-sdk and flow CLI emulator on local. Here is example: https://docs.onflow.org/cadence/tutorial/04-non-fungible-tokens/ Contract: pub contract ExampleNFT { pub resource NFT … --- ## [How to create an account after running the localnet?](https://forum.flow.com/t/how-to-create-an-account-after-running-the-localnet/2125)
**Author:** [@w\_s](https://forum.flow.com/u/w_s)\ **Replies:** 3\ **Last updated:** [July 2, 2021, 4:53pm UTC](https://forum.flow.com/t/how-to-create-an-account-after-running-the-localnet/2125 "2021-07-02T16:53:47Z")
I was able to get the localnet running in the same way as this thread, and from the same thread I also spotted the service account private key. However, the key seems to be slightly different from what’s used in the Flow… --- ## [Placeholder contract addresses in source code](https://forum.flow.com/t/placeholder-contract-addresses-in-source-code/2139)
**Author:** [@aphelionz](https://forum.flow.com/u/aphelionz)\ **Replies:** 2\ **Last updated:** [June 30, 2021, 2:35pm UTC](https://forum.flow.com/t/placeholder-contract-addresses-in-source-code/2139 "2021-06-30T14:35:29Z")
This question is about how to represent token addresses in source code. We’re trying to make sure my project is organized and can be easily used by the Flow CLI, the Go SDK, and Flow FCL. We want our project to be testa… --- ## [Error deploying in Heroku](https://forum.flow.com/t/error-deploying-in-heroku/2103)
**Author:** [@buzz](https://forum.flow.com/u/buzz)\ **Replies:** 0\ **Last updated:** [June 18, 2021, 6:18pm UTC](https://forum.flow.com/t/error-deploying-in-heroku/2103 "2021-06-18T18:18:57Z")
I followed the flow-kitty instructions on their GitHub page and from there i got the private key, account address, kibble, kibble-items, kibble-market place address. In short all the things that are required to deploy th… --- ## [Kitty Items marketplace demo dapp](https://forum.flow.com/t/kitty-items-marketplace-demo-dapp/759)
**Author:** [@jordan\_ck](https://forum.flow.com/u/jordan_ck)\ **Replies:** 7\ **Last updated:** [June 14, 2021, 12:43am UTC](https://forum.flow.com/t/kitty-items-marketplace-demo-dapp/759 "2021-06-14T00:43:11Z")
Hey! We’d like to share our project to help others get started building on Flow. Kitty Items are Flow NFTs for CryptoKitties! It’s a work in progress but you can look at our repos for code examples with FCL, Cadence and… --- ## [How to send transaction with multiple signers using Flow CLI?](https://forum.flow.com/t/how-to-send-transaction-with-multiple-signers-using-flow-cli/2023)
**Author:** [@wolfhaus](https://forum.flow.com/u/wolfhaus)\ **Replies:** 5\ **Last updated:** [June 9, 2021, 2:26pm UTC](https://forum.flow.com/t/how-to-send-transaction-with-multiple-signers-using-flow-cli/2023 "2021-06-09T14:26:03Z")
Hi. I’ve been playing around with Flow for a few weeks now. I want to send a transaction that accepts multiple signers, which seems to be supported and I can do this from the Flow Playground. I can’t figure out how to se… --- ## [Problems Authenticating with Fleek](https://forum.flow.com/t/problems-authenticating-with-fleek/2038)
**Author:** [@guillem](https://forum.flow.com/u/guillem)\ **Replies:** 1\ **Last updated:** [June 9, 2021, 8:22am UTC](https://forum.flow.com/t/problems-authenticating-with-fleek/2038 "2021-06-09T08:22:51Z")
Hello there! I’m trying to develop a webpage that interacts with the onFlow blockchain using Fleek as a deployment tool since I like the idea of using IPFS hosting and different possibilities that Fleek offers. However… --- ## [An issue with playground](https://forum.flow.com/t/an-issue-with-playground/1998)
**Author:** [@ahmad](https://forum.flow.com/u/ahmad)\ **Replies:** 1\ **Last updated:** [June 1, 2021, 3:08pm UTC](https://forum.flow.com/t/an-issue-with-playground/1998 "2021-06-01T15:08:34Z")
Hi FlowMates, I am working on the Cadence tutorial, I deployed HelloWorldResource.cdc on 0x02 account, and sent Load Hello transactions with 0x02 account signature. The result is the image attached to this post, which d… --- ## [Best practice for contract debugging?](https://forum.flow.com/t/best-practice-for-contract-debugging/1978)
**Author:** [@AlexZ](https://forum.flow.com/u/AlexZ)\ **Replies:** 1\ **Last updated:** [May 28, 2021, 4:05pm UTC](https://forum.flow.com/t/best-practice-for-contract-debugging/1978 "2021-05-28T16:05:41Z")
Hi, I’ve prepared first draft of an smart contract on Flow. Now I need to deploy and debug it (on emulator locally I guess). I tried it with Flow Playground web client first. But it does not match my requirements. It do… --- ## [Creating Dapp using DappStarter has issues with yarn start](https://forum.flow.com/t/creating-dapp-using-dappstarter-has-issues-with-yarn-start/1878)
**Author:** [@mashhu](https://forum.flow.com/u/mashhu)\ **Replies:** 2\ **Last updated:** [May 12, 2021, 11:42am UTC](https://forum.flow.com/t/creating-dapp-using-dappstarter-has-issues-with-yarn-start/1878 "2021-05-12T11:42:58Z")
I am following the tutorial TryCrypto DappStarter Workshop - Scaffolding Full-Stack Dapp (around min 15) and the yarn start just runs until it times out. Never opens anything. I saw he used node generate stage flow-nf… --- ## [Invalid address for chain flow-testnet when deploying "kibbles contract"](https://forum.flow.com/t/invalid-address-for-chain-flow-testnet-when-deploying-kibbles-contract/1462)
**Author:** [@Mio](https://forum.flow.com/u/Mio)\ **Replies:** 3\ **Last updated:** [May 11, 2021, 9:40pm UTC](https://forum.flow.com/t/invalid-address-for-chain-flow-testnet-when-deploying-kibbles-contract/1462 "2021-05-11T21:40:25Z")
Hi there, I followed the steps here to run “kitty-items/kitty-item-deployer”. After issuing the command of “npm run start:dev”, there seems to be errors when deploying “kibbles contract”. It seems to be related to inva… --- ## [Struggling to Install vs studio flow extension](https://forum.flow.com/t/struggling-to-install-vs-studio-flow-extension/385)
**Author:** [@Jschupak](https://forum.flow.com/u/Jschupak)\ **Replies:** 5\ **Last updated:** [April 20, 2021, 7:53am UTC](https://forum.flow.com/t/struggling-to-install-vs-studio-flow-extension/385 "2021-04-20T07:53:46Z")
I am having trouble installing the extension please help --- ## [{String: String} broken in Flow Playground](https://forum.flow.com/t/string-string-broken-in-flow-playground/1398)
**Author:** [@FranklinsHand](https://forum.flow.com/u/FranklinsHand)\ **Replies:** 3\ **Last updated:** [April 16, 2021, 2:35pm UTC](https://forum.flow.com/t/string-string-broken-in-flow-playground/1398 "2021-04-16T14:35:38Z")
Whenever I attempt to use the {String: String} input for transactions I get this error Error: GraphQL error: failed to decode argument 0: failed to decode value: invalid JSON Cadence structure I brought the code down t… --- ## [Bootstrapping a flow-go/integration/localnet](https://forum.flow.com/t/bootstrapping-a-flow-go-integration-localnet/1615)
**Author:** [@morgan](https://forum.flow.com/u/morgan)\ **Replies:** 6\ **Last updated:** [April 11, 2021, 1:58pm UTC](https://forum.flow.com/t/bootstrapping-a-flow-go-integration-localnet/1615 "2021-04-11T13:58:42Z")
I want to use a localnet for development. After running make init and make start I get a running set of access, collection, consensus, and execution nodes. I can access the AccessAPI through localhost, but I’m not sure w… [Previous page](https://forum.flow.com/c/developer-tools/11.md) [Next page](https://forum.flow.com/c/developer-tools/11.md?page=2)