Stuck with an error message

For a study project we needed to make an app with mendix. I had a good base already but after trying to implement something form the app store I got an error everytime I tried to run it and can manage to get rid of it. (see image) How can I make my app run again?
1 answers

View the Error pane (View → Error list). The is likely an error there. If it is not getting you to the solution, share that error with us.

If there is no error in the Error pane, then try Project → Clear project directory and retry to run the project.