ERROR: JoinClauseSelectivity

Hi everyone,

I'm trying to do a simple join query and I get an error message.
My tables are :
agency(agencyid serial, agency_name text, address text, ...)
groupleader(leaderid serial, agency_name text, phonenum text , ...)

The query :
SELECT agencyid FROM agency, groupleader WHERE
       agency.agency_name=groupleader.agency_name;

The error message :
ERROR:  JoinClauseSelectivity: bad value 2.450299

I tried the query in other forms such as:
SELECT * FROM agency, groupleader WHERE
        agency.agency_name=groupleader.agency_name;
and
SELECT * FROM agency WHERE
         agency_name=groupleader.agency_name;

I get the same error message. What am I doing wrong here ?

Thanks for your help,
-Sheila
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