cannot connect to database and strange error

Every time I try to connect to the database, I get this

bash$ psql whatsdown
FATAL 1:  FillScanKeyEntry: no procedure for operator 661
Connection to database 'whatsdown' failed.
FATAL 1:  FillScanKeyEntry: no procedure for operator 661


I haven't found info about the message.

This happen with only one database on the server. The others works
correctly.

thanks in advance

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