postgres 6.5.1

I have a problem with my D.B.
I'm using linux 5.2 and postgres 6.5.1
When i try to delete a table with 300,000 rows, the first time, postgres
show me the next message:

        heap delete: (am) invalid tid

If i try to delete it again , the message is the follow:

        ExecutePlan: (junk) 'ctid' is NULL!

and there is a third message:

        Cannot open segment 1 of relation lista_nominal

where lista_nominal is the table that has the problem.

I don't understand the messages, i hope someone can help me


Adrian Perez Camarena
IFE