We move from 3.3.10 to 4.0.3, after that, we can't to reply in ticket agent interface. Furthermore, we can't to create new agents in admin option. When we choose Reply option, the error is displayed:
Checking apache logs at /var/log/apache/error.log we foundInternal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, admin@server.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Any guesses?. Thanks a lot[Wed Jan 7 17:18:11 2015] -e: Malformed UTF-8 character (unexpected end of string) in substitution (s///) at /opt/otrs/Kernel/cpan-lib/JSON/PP.pm line 468.
[Wed Jan 7 17:18:11 2015] -e: (in cleanup) Can't call method "Get" on an undefined value at /opt/otrs//Kernel/System/AuthSession/DB.pm line 583.
[Wed Jan 07 17:18:11 2015] [error] Malformed UTF-8 character (fatal) at /opt/otrs/Kernel/cpan-lib/JSON/PP.pm line 468.\n\t(in cleanup) Can't call method "Get" on an undefined value at /opt/otrs//Kernel/System/AuthSession/DB.pm line 583.\n
Eduardo.