My mod seems to be looking for a file that doesn't exist

i try to build my mod or run client but the console says it can't find a file called "Thumbs.db" in my block textures file? I never created a block called thumbs or something (who would?) and i don't know what to do to fix this

it says: Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

I don't know how to do this either