I’ve been away from home, and thus have been working on my project on my laptop. After I transferred it to my desktop, however, I can’t open it. Whenever I try, it gives me an error about creating a temp folder, and suggests that it’s because it either lacks the rights or space to do so. I’m running it as an admin, and all necessary folders are public. I have 300GB of free space. What’s the deal with this? It does this even when I try to make a new project.
I can open the project fine through an external harddrive, but running it off of that drive is a very sketchy idea since it frequently has problems. What’s going on here?
I’m guessing (as this has happened to me once, too) that you copied only the assets folder over, and not the library folder. If so, try copying the entire folder of your project.
It’s due to your project path having Chinese characters. Just ran on the same problem. Just put your project in a path using simple ASCII characters, not Chinese and probably not UTF-only characters.
It is strange that this bug is ** still ** on the editor as is Unity 4.5.5
Just in case anyone has a similar issue as of Unity 5.1 if there are any files in the project directory that you do not have permissions to open Unity will close saying “Multiple Unity instances can’t open the same project.” This may happen if you are moving files manually to another machine or if you accidentally run an automated build as a different user account, as was my case.