Random "project problems"?

Troubleshooting SDK
1

Hi,

I opened my IDE this morning, and for one of my projects, I got this:

All of my other projects don’t have an issue. It’s just this one that has randomly got these “project problems”.

I have tried to click the “resolve problems” button, but it just wants me to find the file and I don’t know where it is, nor why all my other projects can find them but this one can’t.

Not sure what’s up here. Could anybody point me in the right direction?

2

Try to open your project properties (right click your project) and remove your libraries. Then add them again.

3

Those are 3.0 Libraries (because they are named jME3 instead of jme3), are you opening the project in 3.1?
If so you can right click and select upgrade project, if not, do what @Domenic said