could not find block containing chunk 0x8483530

select *, lower(name) from student;
gives error: could not find block containing chunk 0x8483530

what does this error mean & what may be the cause?


template1=# \d student
    Table "public.student"
 Column |  Type   | Modifiers
--------+---------+-----------
 name   | devchar |
 age    | integer |

Regards
Vinay

--
Vinay Jain
Dissertation Project Trainee
DAKE Division
C-DAC Mumbai