# Q&A/Troubleshooting **URL:** https://forum.availproject.org/c/developers/q-a-support/21.md [Latest](https://forum.availproject.org/latest.md) · [Categories](https://forum.availproject.org/categories.md) · [Tags](https://forum.availproject.org/tags.md) --- ## [\[TEMPLATE\] Asking a good question](https://forum.availproject.org/t/template-asking-a-good-question/33)
**Author:** [@robin-rrt](https://forum.availproject.org/u/robin-rrt)\ **Replies:** 6\ **Last updated:** [April 5, 2024, 6:04pm UTC](https://forum.availproject.org/t/template-asking-a-good-question/33 "2024-04-05T18:04:42Z")
How to ask a good question: This guide from Stack Overflow is a good resource to check out how to ask a question. Use this sub-category to ask questions related to bugs and errors you face while building on Avail. St… --- ## [About the Q&A/Troubleshooting category](https://forum.availproject.org/t/about-the-q-a-troubleshooting-category/34)
**Author:** [@robin-rrt](https://forum.availproject.org/u/robin-rrt)\ **Replies:** 0
Use this space for asking questions about any problems you encounter while building or running on Avail. Follow the template as a guide to help frame better questions for better support. --- ## [Error while getting constructed tx with api.tx](https://forum.availproject.org/t/error-while-getting-constructed-tx-with-api-tx/1351)
**Author:** [@JozzyScript](https://forum.availproject.org/u/JozzyScript)\ **Replies:** 1\ **Last updated:** [April 26, 2024, 10:31am UTC](https://forum.availproject.org/t/error-while-getting-constructed-tx-with-api-tx/1351 "2024-04-26T10:31:33Z")
Hello, I am trying to construct a transaction and broadcast it. I am offline signing the transaction. The code below is how i construct the transaction. const \[ { address: toAddress, amount, }, … --- ## [Thread 'tokio-runtime-worker' panicked at your/path: must have active request for stream](https://forum.availproject.org/t/thread-tokio-runtime-worker-panicked-at-your-path-must-have-active-request-for-stream/722)
**Author:** [@Nirnaeth](https://forum.availproject.org/u/Nirnaeth)\ **Replies:** 5\ **Last updated:** [April 5, 2024, 5:57am UTC](https://forum.availproject.org/t/thread-tokio-runtime-worker-panicked-at-your-path-must-have-active-request-for-stream/722 "2024-04-05T05:57:19Z")
I am running a light client but it crashed like this: 2023-12-07T08:02:38.219861Z INFO avail\_light::sync\_client: Block header 7233 already in DB 2023-12-07T08:02:38.219918Z INFO avail\_light::sync\_client: Block header … --- ## [WARN avail\_light::network::rpc::subscriptions: Signature verification fails with default set\_id 215, trying alternatives](https://forum.availproject.org/t/warn-avail-light-signature-verification-fails-with-default-set-id-215-trying-alternatives/1185)
**Author:** [@Nirnaeth](https://forum.availproject.org/u/Nirnaeth)\ **Replies:** 1\ **Last updated:** [March 18, 2024, 12:01pm UTC](https://forum.availproject.org/t/warn-avail-light-signature-verification-fails-with-default-set-id-215-trying-alternatives/1185 "2024-03-18T12:01:40Z")
I have started to see signature warning in light client logs. Maybe it requires investigating. Version: 1.7.9 OS: Ubuntu 22.04 2024-03-11T20:54:03.777110Z DEBUG avail\_light::maintenance: Maintenance completed block\_nu… --- ## [Error with both avail and polkadot sdk calling api.rpc.chain.getBlock](https://forum.availproject.org/t/error-with-both-avail-and-polkadot-sdk-calling-api-rpc-chain-getblock/1174)
**Author:** [@JozzyScript](https://forum.availproject.org/u/JozzyScript)\ **Replies:** 2\ **Last updated:** [March 8, 2024, 6:13am UTC](https://forum.availproject.org/t/error-with-both-avail-and-polkadot-sdk-calling-api-rpc-chain-getblock/1174 "2024-03-08T06:13:12Z")
Hello, i am trying to interact with blockchain via @polkadot ts library and the starting point is to get the latest finalized block. However, i could not manage to get a block with (I am connecting to testnet with wss:/… --- ## [Message: RPC Subscription stream should be infinite](https://forum.availproject.org/t/message-rpc-subscription-stream-should-be-infinite/797)
**Author:** [@Nirnaeth](https://forum.availproject.org/u/Nirnaeth)\ **Replies:** 12\ **Last updated:** [March 6, 2024, 11:54am UTC](https://forum.availproject.org/t/message-rpc-subscription-stream-should-be-infinite/797 "2024-03-06T11:54:44Z")
I am running avail light client on ubuntu 22.04 amd64 architecture LC version is v1.7.4. My client crashed like this: 2023-12-15T10:33:49.633435Z INFO avail\_light::network: Cells fetched from DHT block\_number=14448 cel… --- ## [OP Stack Setting up L2 configuration ERROR - "json: cannot unmarshal string into Go struct field Deployment.args of type \[\]interface {}"](https://forum.availproject.org/t/op-stack-setting-up-l2-configuration-error-json-cannot-unmarshal-string-into-go-struct-field-deployment-args-of-type-interface/566)
**Author:** [@robin-rrt](https://forum.availproject.org/u/robin-rrt)\ **Replies:** 49\ **Last updated:** [December 11, 2023, 7:08am UTC](https://forum.availproject.org/t/op-stack-setting-up-l2-configuration-error-json-cannot-unmarshal-string-into-go-struct-field-deployment-args-of-type-interface/566 "2023-12-11T07:08:17Z")
@Thanh\_Nguyen Facing the above error when trying to run an OP Stack L2 powered by Avail. Referring: --- ## [:: Abnormal Closure PORTABLEREGISTRY: Unable to determine runtime Call type](https://forum.availproject.org/t/abnormal-closure-portableregistry-unable-to-determine-runtime-call-type/563)
**Author:** [@megumii](https://forum.availproject.org/u/megumii)\ **Replies:** 11\ **Last updated:** [November 27, 2023, 9:30am UTC](https://forum.availproject.org/t/abnormal-closure-portableregistry-unable-to-determine-runtime-call-type/563 "2023-11-27T09:30:22Z")
I got this error when i try to use any examples from here https://github.com/availproject/avail-js/tree/main/examples $ npm start \> data-transfer@0.0.1 start \> tsc && node build/index.js 2023-11-27 13:01:59 A… --- ## [Error: Not signer by this signature (avail light node)](https://forum.availproject.org/t/error-not-signer-by-this-signature-avail-light-node/95)
**Author:** [@Nirnaeth](https://forum.availproject.org/u/Nirnaeth)\ **Replies:** 14\ **Last updated:** [November 21, 2023, 8:39am UTC](https://forum.availproject.org/t/error-not-signer-by-this-signature-avail-light-node/95 "2023-11-21T08:39:34Z")
I am running a Light client and synced from scratch. After synced I frequently see an error messages which is shown in the screenshot. How to diagnose and fix this? OS: Ubuntu 22.04 (arm64) Light node version: v1.7.2 … --- ## [Error: Failed to receive error message (Light Node)](https://forum.availproject.org/t/error-failed-to-receive-error-message-light-node/374)
**Author:** [@Nirnaeth](https://forum.availproject.org/u/Nirnaeth)\ **Replies:** 1\ **Last updated:** [November 15, 2023, 8:42am UTC](https://forum.availproject.org/t/error-failed-to-receive-error-message-light-node/374 "2023-11-15T08:42:21Z")
Hello I am running a light node on ubuntu 22.04 aarch64 (node version is 1.7.3) and I faced an error which shown below: 2023-11-11T09:43:42.786532Z INFO avail\_light::api::v2: Message published to clients topic=HeaderVe… --- ## [I can't transfer Token with Polkadot extension](https://forum.availproject.org/t/i-cant-transfer-token-with-polkadot-extension/115)
**Author:** [@Sam2021](https://forum.availproject.org/u/Sam2021)\ **Replies:** 3\ **Last updated:** [October 30, 2023, 2:51pm UTC](https://forum.availproject.org/t/i-cant-transfer-token-with-polkadot-extension/115 "2023-10-30T14:51:26Z")
Hello Admin, I can transfer Val no problem without Polkadot extension. But when I installed Polkadot extension. I can’t transfer Val. It said that : “balances.transferKeepAlive 1010: Invalid Transaction: Transaction …