0 = `ERR_NONE`  
1 = `ERR_NETWORK`  
2 = `ERR_REMOTESERVER`  
3 = `ERR_RUNTIME`  
4 = `ERR_UNEXPECTEDSERVERRESPONSE`  
5 = `ERR_DIFFDOMAINSINSYNCSRC`  
6 = `ERR_NOSERVERRESPONSE`  
7 = `ERR_CLIENTISNOTLOGGEDIN`  
8 = `ERR_CUSTOMSYNCSERVER`  
9 = `ERR_UNATHORIZED`