[rt-users] What means this / Coding error?

[sc2 at gmx.at]

hello
how i can fix this encode error ?
thx
[Wed Jan 12 09:59:12 2005] [error]: Encoding error: Unknown encoding 
'unicode-1-1-utf-7' at /home/htdocs/rt3/lib/RT/I18N.pm line 433

Stack:
  [/usr/local/lib/perl5/5.8.4/Carp.pm:191]
  [/usr/local/lib/perl5/5.8.4/i686-linux/Encode.pm:177]
  [/home/htdocs/rt3/lib/RT/I18N.pm:433]
  [/home/htdocs/rt3/lib/RT/I18N.pm:192]
  [/home/htdocs/rt3/lib/RT/I18N.pm:184]
  [/home/htdocs/rt3/lib/RT/EmailParser.pm:334]
  [/home/htdocs/rt3/lib/RT/EmailParser.pm:311]
  [/home/htdocs/rt3/lib/RT/EmailParser.pm:284]
  [/home/htdocs/rt3/lib/RT/EmailParser.pm:212]
  [/home/htdocs/rt3/lib/RT/Interface/Email.pm:442]
  [/home/htdocs/rt3/share/html/REST/1.0/NoAuth/mail-gateway:55]
 defaulting to ISO-8859-1 -> UTF-8 (/home/htdocs/rt3/lib/RT/I18N.pm:436)
[Wed Jan 12 09:59:13 2005] [error]: Encoding error: Unknown encoding 
'unicode-1-1-utf-7' at /home/htdocs/rt3/lib/RT/I18N.pm line 226