server closed unexpectedly while executing a function

Hi
I'm running a function in perl and it says

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NOTICE: DBD::Pg::st execute failed: server closed the connection
unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

CONTEXT: SQL statement "SELECT sp_email( $1 , $2 )"
PL/pgSQL function "func_trg_email" line 2 at perform
NOTICE: DBD::Pg::st execute failed: no connection to the server

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how can i get more verbose messages that would tell me where exactly I'm
going wrong.
I'm calling function sp_email from a trigger function func_trg_email here.

Thanks,
jas