JUnit - ClassNotFoundErr

I have a big problem. I was working on my project - then suddently some of the unit-tests fail with a "ClassNotFoundErr"!
Arghl. Don't know, what I've changed...

I have the following project structure:

- classes
- classes-test
- src
- src-test

Those paths are defined in the module configuration.

I use the following JUnit-Configuration:
"All in packages" with package "de"
Working directory: "project"

When I try to test one single class I also get a ClassNotFoundErr (this is an issue since a very, very long time...). Can anybody help me?

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