While calendarserver 7.0 now works fine in Debian, I see the following errors in my error.log: 2015-10-25 23:24:29+0530 [-] [caldav-0] [PooledMemCacheProtocol,client] [twistedcaldav.memcachepool.MemCachePool#error] Memcache error: Invalid type for key: <type 'unicode'>, expecting a string; request: set cacheToken:/calendars/__uids__/0C8BDE62-E600-4696-83D3-8B5ECABDFD2E/calendar/ 87c92808-420e-4778-af6e-45eee01d02a4 2015-10-25 23:24:29+0530 [-] [caldav-0] [PooledMemCacheProtocol,client] [twistedcaldav.memcachepool.MemCachePool#error] Memcache error: Invalid type for key: <type 'unicode'>, expecting a string; request: set cacheToken:/calendars/__uids__/0C8BDE62-E600-4696-83D3-8B5ECABDFD2E/ 1b419724-321d-43b1-bbc2-c6c20f8389ce Any clue on why I am getting these errors? Thanks, Rahul.