Game crashes immediately upon trying to host a game

In your client_log, the game mentions a permissions issue:

Could not open directory [/home/<username>/.klei//DoNotStarveTogether/123769343/Cluster_1/Caves/]

not sure how it happened, but it appears to have lost read/write access to the games save data directory.

I have tried hosting some worlds, it never works, every time i try host, the game crashes on the loading screen and doesn't give me any information about why, it gives me the APPCRASH error and a few numbers.