Currently unable to render AE Beta > AME Beta

Since updating to Mac OS Big Sur 11.2.1, I have been unable to successfully render from AE Beta to AME Beta. I get this error: "Could not read from the source. Please check if it has moved or been deleted."

Project files have not moved or been deleted. I reinstalled clean new versions of AE and AME this morning, and the error is still persisting. 

Thanks for any help with this!