"Fang Genjie" <[EMAIL PROTECTED]> writes:
> [EMAIL PROTECTED] postgresql-7.4.5]$ createlang plpgsql BBMF

> ERROR:  Load of file /usr/local/pgsql/lib/plpgsql.so failed:
> /usr/local/pgsql/lib/plpgsql.so: undefined symbol: error_context_stack

Looks like you are trying to load a 7.4 plpgsql.so into a pre-7.4
backend.  You sure you updated your server?

                        regards, tom lane

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