Deploytool error - PackagingLog.txt does not exist

When trying to build a certain project within the deploytool GUI, I get the following error

Any idea what it means? Any idea how to fix it? It's definitely not referring to a file supplied by me.

Also, I have previously compiled this project several times. I definitely broke something, but can't tell what.

Answer 1

[Matt J]

Somehow, the file PackagingLog.txt got added to the list of additional files specified in the .prj file. Deleting it through the deploytool GUI solved the problem.

I still don't know where the file came from, however. It got mysteriously included in the project after I aborted a previous build.