Invoke Pipeline Failing With Error 2015 – “Value cannot be null. Parameter name: source”

Saraswathi_k   no so long ago, someone raised this exact same thing, in that case, it was a DB2 connection, here's the discussion  Re: Invoke Pipeline fails with Error code 2015: 'V... - Microsoft Fabric Community, 

but the error was EXACLTY THE SAME "The child pipeline fails consistently with this error:  Fabric activity failed. 'Value cannot be null.  Parameter name: source '." 

I would recommed two actions ... 

#1. Report this to MSFT, I think there's a bug flying around on the new Invoke Pipeline task 

#2. Use the legacy Invoke Pipeline and try, on that case, that was the workaround.... the legacy is working fine .

Best of lucks! If you find this info. useful, I would appreciate a thumb-up, and if it fixes your issue, mark as solution for other people facing the same... all the best