Hi I am seeing this error when trying to register my workflo

Question

Hi I am seeing this error when trying to register my workflow ```Failed with Unknown Exception lt class AssertionError gt Reason Cannot pass output from task n3 that produces no outputs to a downstream task``` How do I find more information about this Which task is this referring to

Kevin Su · Answer

There is a task supposed to create a output but it didn t would you mind sharing your workflow code we can improve error message

Victor Churikov · Answer

In my experience this error was caused by not specifying the output type for a task such as ``` task def mytask input1 str return input1``` This change made it work ```def mytask input1 str gt str return input1``` Look through your tasks for a task that is supposed to return something but doesn t specify which type it returns Also make sure that you are not trying to receive as an input the promise from a task that isn t supposed to return anything

Nandakumar Raghu · Answer

Ok thanks I will check that