MDS Resources not accepted

Hi there
I have tried to make a workflow and save to Volume. But I get always the following Message:

The resource Folder … in the workflow … doesn’t contain any packages/apps or no longer exists.<
Please specify a valid resources folder and try again.

But I have in this folder a lot of PKG`s. I also have tried with only one PKG but it doesn’t work.

Any Idea…

Can you try reselecting the packages folder?

It was my fault, because I was in my Folder Structure to high.
thanks anyway