'ProjectExtensions' added every time I open Unity

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My Unity project fails to load in Visual Studio every time I open Unity or select “Resync Monodevelop”, giving me this error:

The attribute “xmlns” in element ProjectExtensions is unrecognized

If I edit the Assembly-CSharp project file, remove that element, and then reload the project, it will work fine, but the next time I open Unity up, it will be back.

How can I stop this from happening?

I know this post is a few months old but did you get a resolution to this as I'm having the same issue and would really like to get it resolved.

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1 Answer

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OK. I’ve managed to resolve this issue in VS2013 by doing the following:

Make sure Unity is closed
Rename the old project folder (for example .old
Create a new project folder called exactly the same as the original project folder (for example )
Copy the complete assets folder from the original project folder to the new project folder. Don’t move it, just copy it, so you can go back to it if you do anything wrong

If you had any custom layers or tags:
Create a folder called ProjectSettings inside the root of the new project folder
Copy the TagManager.asset file from the old ProjectSettings folder to the new ProjectSettings folder

Load Unity

Hope this helps someone.