On top menu of studio, go to edit and then find. Use that project wide search to find for the TestOfCat.
If not found then,
Right click the error, if there is any option to mark as resolved then try that. Then run locally the project. Check if it runs
Strange, the attribute that the errormessage says to be referring to, ‘MyFirstModuleProject.TestOfCat’, seems to be an entity in the domain of module MyFirstModuleProject.
You can right click the errormessage to see where it can take you.
Also, Ctrl-f gives you a textsearch.
if that does not help then add some screenshots of the error message with as much detail as you think useful.