[imp] [Help] Fatal error (but I am not sure the reason)

[Mac Table]

Hello all,

How come I meet this error message when I click one of
my messages (only this one, others are no problem)

Fatal error: Allowed memory size of 8388608 bytes
exhausted (tried to allocate 2424167 bytes) in
/var/www/horde/lib/Text.php on line 83

Fatal error: Allowed memory size of 8388608 bytes
exhausted (tried to allocate 140 bytes) in Unknown on
line 0

Please give me some hints.....  Thanks a lot!

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