Tsearch2 cache lookup problem

Hi i have a problem using tsearch2 with postgresql. Executing:
SELECT to_tsquery('default','kj');

return a
cache lookup failed for function 141542.

But it's strange this happens now but not before and nothing has done on
database...some data break with tsearch2?
I am using postgres 7.4.6 and no dump restore occurs before this error
appear.

Yours faithfully
John Slave
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