Object Reference Not set to an instance of an object

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Posted on by YasirKhan

Hi Everyone,

Hi There,

I get an error on Visual Studio when I open the Project. I am using Visual Studio 2017.

Its gives the error "Object Reference Not set to an instance of an object" tried couple of things I found n the web and no success.

I have attached the Screen shot of what happens.Neither I can build models and even synchronization database is running continue??

Many errors getting while opening visual studio also "Object Reference Not set to an instance of an object" Value cannot be null error reading metadata

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Martin Dráb 237,801 Most Valuable Professional on at

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As the first thing, I would restart the machine. It sometimes solves weird problems.

Did it work before? If so, what has changed? For example, didn't you install an update or something?

If I understand it correctly, you're getting errors already when opening VS; it's not a problem specific to opening of a project. Is that correct?

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GirishS 27,827 Moderator on at

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Hi Yasir Khan,

Last screenshot you have pasted is not clear. Its saying something like metadata is corrupted or there is duplicate elements with same name in different models. Check whether you have duplicate items(Elements with same name in multiple models) in the custom model.

Thanks,

Girish S.

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YasirKhan 60 on at

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Visual Studio was updated and problem that any project I am opening ,Object Reference Not set to an instance of an object is shown in output window also. Earlier it was working

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YasirKhan 60 on at

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Thanks for that and what about other errors you have to say.

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GirishS 27,827 Moderator on at

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Hi Yashir Khan,

Because of the duplicate elements in the custom model you are getting all the above error I guess. Try to find out the duplicate elements in your custom models and delete them or rename it.

Thanks,

Girish S.

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YasirKhan 60 on at

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But I am unable to open projects,How can I find duplicate elements in custom models?Do I have to go source/repos folder of projects

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GirishS 27,827 Moderator on at

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Is the Application explorer opening? If yes you can search it there.

Also as per martin comments what changes you made to the model before the issue is thrown? Also he said to restart the server - Have you done that?

Thanks,

Girish S.

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Martin Dráb 237,801 Most Valuable Professional on at

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Projects don't contain actual model elements. They're stored in the metadata folder (PackagesLocalDirectory, by default).

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YasirKhan 60 on at

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I have restarted the server and still same issue.

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YasirKhan 60 on at

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These errors were already coming before update visual studio also.

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