Got error message when trying to run locally but no error to be found

I try to Run Locally and get at message “The project cannot be deployed at this time because there are errors. Please solve the errors listed in the Error List window.”  However, there are no Errors shown, regardless If I keep my window clean or look into every single module and Domain Model.  Where else could Errors be looked for? 
1 answers

A couple of possible workarounds i normally try, not sure if that will fix it:
- force an error and then remove the error, see if that helps
- clean deployment folder
- deploy for eclipse
- try again