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Unity don't save anything: MetaData class can't be loaded
I reinstalled Unity because MonoDevelop hadn't started (it threw an error). Then I opened my last project, and in the console there were a lot of messages:
Rebuiling GUID cache: Deleting metadata library/metadata/3c/3cd20fff9319d49e9a8e7c57338eb004 because it is an invalid meta data file! MetaData class can't be loaded
I just simply ignored them and cleared the console. I made some changes in the player and build settings, and I started the build but Unity freezed and I needed to close it in the task manager. Then I reopened it, and I saw that Unity hadn't saved my changes BUT I saved the project before the building process... So i made my settings again and I saved my project, I closed Unity, then I opened it again and my changes weren't saved!
So I can't make any changes to my project and I can't build my game. (I tried reinstall Unity again but it isn't a solution to the problem).
Please HELP. I spent 3 days to solve an other Unity bug and now there's this bug :'(