Issue with database error: ERROR: invalid page header in block 579 of relation base/24067/12574

Can you please help rectify the error below:

task_hst=# select * from systables;

ERROR: invalid page header in block 579 of relation base/24067/12574

CONTEXT: SQL statement "SELECT COUNT(*)

FROM pg_indexes

WHERE tablename = myname

AND schemaname = 'public'"

PL/pgSQL function "getidxcnt" line 5 at SQL statement

task_hst=# select * from pg_indexes;

ERROR: invalid page header in block 637 of relation base/24067/12548

Similar errors also occur when using pg_dump on some database tables

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