could not open relation 1663/16525/2604: no such file or dir

Help,
alfter my computer chrashing, when I try to read a table by using pgAdmin I
get the following errors:
could not open relation 1663/16525/2604
could not open relation 1663/16525/2611
could not open relation 1663/16525/2604
after that if I push ok I can see the data in the tables
I see in the proprieties window that the create definition miss the fields.
The conseguencies consists on I can't perform the backUp.

How can I solve the problem ?
Thanks in advance
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