Could not open an app in mendix modeler

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I have created a mobile app in web, but I was not able to open it in mendix modeler. Its throwing following error. And i am not getting an option to select local folder while opening the app. Can anyone help me on this?  
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1 answers
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Please search the forum for the follwoing term:

"Object reference not set to an instance of an object"

THere are quite a number of questions on this subject with some answers that might be helpfull in your case.

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