Can't Sync to online lib

Can anyone help? The sync stop  four hours ago, now my Online Sync Lib only have 64 items, when my references are up to 70 on my desktop already. the following appear: 

Sync Details
Sync was last run: Friday, December 30, 2016 at 13:06:36 PM +0800
Sync Status: There are changes that need to be sent.
Error Code: Server.AuthenticationToken.invalidUserCredentials
Error Message: The username/password specified is not valid.

Local Sync Library
Library Name: my file name
References: 70
Groups: 0
Group Sets: 1
Attachments: 104

Online Sync Library
Username:  my email 
Serial Number: Unable to contact the online service.
References: Unknown
Groups: Unknown
Group Sets: Unknown
Attachments: Unknown

Sync Limits
Number of References: Unknown
Number of Groups: Unknown
Number of Group Sets: Unknown
Attachment Storage: Unknown