"Import application error: Either this is not a valid name or an object with that name already exists. model.Model"

Intially First App as like of following Snap:

then Second App as like of following Snap:                          

Scenario:
                 while I'm importing jar in one another project. i got this warning and error message.

Resolution for the above problem is :

                 i realize that i'm having same model name and same package name and same application module name. after i rename all those things. 

Finally,
without any error jar imported successfully then it works fine.