"TypeError: engine is not a symbol" when using Google Speech-to-text

I am trying to use Google speech to text for the transcription.
Everything else works but as soon as I activate it I get the Error message: TypeError: engine is not a symbol
I followed the tutorial on the website/Youtube and also placed my API key in my profile with the name sound.AudioClip.Engine.GOOGLE as was described in another thread but it still doesnt work.
Help would be greatly appreciated!

Do you have a case mismatch? The error message says engine but your API key says Engine.

Thanks for the reply! No because I had this error before I added sound.AudioClip.Engine.GOOGLE

What line does the error come from?