in mendix pro when I open app at first time then repoen app then Error Occures in database connection

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I have an error , when run mendix application at first time the app work successfully but if close the app then run it again without any changes , the app crashes with these errors of database connection , can anyone help me to solve this problem , all photos for this error and data model are below (Hint) I tried many versions of mendix pro and the same error occure
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2 answers
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Hi eslam elassal, 


Please check in which format you store the $TrainingEvent/StartDate or the $TrainingEvent/EndDate or $Registration/Date…
Seeing the error message:  data exception: invalid datetime format,

I'm guessing something is going wrong in one of the above fields.

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You could try to remove the database folder from your project and run studio pro again to determine if your current database has somehow become corrupted. This will give you a clean and empty database to start with.

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