export from oracle8i and import into oracle8.0.5

hi there

i have a problem with an import, which is exported from an oracle 8i enterprise server.
i want to import into oracle8 standard server. if i start the import with a command like :
imp formuser=bla touser=foo file=exp01.dmp oracle throws the follwing exception:
imp-0008 unrecognized statement in the export file

i have never had any problems with import/export, so i'm really wondering about that.

thanks in advance

                                                    thomas