Error Code 1 was returned by the Audio driver

Whenever I try to export a podcast to MP3 - using good quality, I get multiple errors. A little box pops up saying "Error Code 1 was returned by the Audio driver".

In the saved file there is a short one second pause wherever that particular error has shown up.

Has anyone experienced this error and knows of a solution? I am utterly clueless, not very experienced with Garageband at all...

Thank you in advance!