There should be an error message telling you which Variable/Node is trying to access none.
Just guessing, I assume it tries to access your .wav file you deleted, or that you renamed after importing, or moved to a different location.
There should be an error message telling you which Variable/Node is trying to access none.
Just guessing, I assume it tries to access your .wav file you deleted, or that you renamed after importing, or moved to a different location.