attachment problem with imp 2.2.7

[EdwardSPL@ita.org.mo]

Hello,

Can you help me to solve these problems ( error messages ) ?

Warning: Max file size of 2097152 bytes exceeded - file [file_upload]
not saved in
/home/webmaster/html/horde/imp/compose.php3 on line 1

Warning: Cannot add more header information - the header was already
sent (header
information may be added only before any output is generated from the
script - check for text
or whitespace outside PHP tags, or calls to functions that output text)
in session.inc on line
439

Warning: Cannot add more header information - the header was already
sent (header
information may be added only before any output is generated from the
script - check for text
or whitespace outside PHP tags, or calls to functions that output text)
in session.inc on line
440

Warning: Cannot add more header information - the header was already
sent (header
information may be added only before any output is generated from the
script - check for text
or whitespace outside PHP tags, or calls to functions that output text)
in
./templates/doctype.inc on line 8

Thank for your help !

Edward.