error with pgdump

hi all
im new user with posgres , we use a sofware solution based on postgres sql to store database.
when i want dump database for backup

pg_dump -h localhost -b -Fc -U applicationdbuser application  -f fichier.dmp
after a few time i have this error

EERROR: invalid page header in block 10 of relation "pg_toast_16610"

have you an idea to fix it ?


i have try to reindex , when i search on google or forum i have see this solution  for same case

with command
reindex index pg_toast.pg_toast_16610;

but i have this error
relation "pg_toast.pg_toast_16610" d'ont exist

thanks a lot