OTRS Stopped Pulling in Tickets

[mallesh]

hello friends,
again i am facing mail fetch error , crontab running but mails are not fetching.
below is my error when cron command run mannully.

Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in pattern match (m//) at /opt/otrs/Kernel/System/PostMaster/Filter/MatchDBSource.pm line 78.
Malformed UTF-8 character (character 0xffff) in substitution (s///) at /opt/otrs/Kernel/System/Ticket/Article.pm line 215.
Malformed UTF-8 character (character 0xffff) in substitution (s///) at /opt/otrs/Kernel/System/Ticket/Article.pm line 215.
Malformed UTF-8 character (character 0xffff) in substitution (s///) at /opt/otrs/Kernel/System/Ticket/Article.pm line 1625.
Malformed UTF-8 character (character 0xffff) in substitution (s///) at /opt/otrs/Kernel/System/Ticket/Article.pm line 1625.
Malformed UTF-8 character (character 0xffff) in substitution (s///) at /opt/otrs/Kernel/cpan-lib/Mail/Address.pm line 68.
Malformed UTF-8 character (fatal) at /opt/otrs/Kernel/cpan-lib/Mail/Address.pm line 69.

My Config.pm is allready setup.

$Self->{'DefaultCharset'} = 'utf-8'

this is issue comes in earlly morning by today in back days OTRS is working fine not at any issue.

Thanks in Adavance