Did not find any initialized language workers

Question

We have an azure function that monitors a poison queue and are seeing an increase in this error message: "Did not find any initialized language workers". What does this error mean and how can we prevent it? Below is the stack trace. Running .net 7. Isolated process functions.

Microsoft.Azure.WebJobs.Host.FunctionInvocationException:
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+

Answer 1

@Jon Christensen Thanks for reaching out.

Can you please confirm if you are getting this error while running your code in azure function or while testing it in your local machine?

Looking at the error it seems like when the function invocation took place, there was not a worker available for it. This could point to a worker crash from a previous function invocation or worker initialization issue. If you are injecting any dependencies, please check if they are done properly and correct versions of SDK are being used.

In case you are getting the error in azure function then please share more details what FUNCTIONS_WORKER_RUNTIME environment you have set in your function and default version that you have set. If you are observing the issue in local environment then please try re-installing the function core tool and see if it helps.

Answer 2

Same issue. I temporary solved it restarting my function.

Here the my FUNCTIONS_WORKER_RUNTIME