You'll have to check where your project is saved: if the path is too long, try to place the project elsewhere or shorten some parts of the directory. For instance, your path might be something like this:
C:\Installed Software\Mendix\SomeSuperlongfoldername\anotherfolder\anotherfolder\someveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeerylongfoldername\Projects\YourProject-Main
In which case it would help to put the project in one of the higher level folders so that all the long folder names are removed from the path.
It seems like the file path is too long. You can try LongPathTool to manage and fix long paths. Shortening paths or using symbolic links, as you've done, can also help avoid crashes.