SQL state 58P01 triggered by a database script execution

I have a database under Postgres v8.3 and I generated its backups script using PGAdmin III.

I executed the same script under Postgres v8.2 in order to create the same database but I get the following error

" ERROR: could not access file "$libdir/pageinspect": No such file or directory

  SQL state :58P01"

Is this error related to the difference of versions ?

Thanks in advance.