Hey Fedotich,
There are a couple of things you can try to resolve this. First, if you go to Editor Settings > General - Experimental, you can click a check box to Enable Long File Paths. This may help with your situation. If it does not, can you move the project itself to a root folder on one of your disks? That will reduce the file path length and may resolve the issue as well.
Please let me know if either of these solutions work for you!