Dumpfile from Oracle 11g to Oracle 10g

I use exp to dumpfile in 11.2.0.1.0 and imp from dumpfile in Release 10.2.0.1.0, but i got this errors,
IMP-00010: not a valid export file, header failed verification
IMP-00000: Import terminated unsuccessfully

So, i change the way to dumpfile from Oracle 11g to Oracle 10g, use expdp-impdp
1. expdp wi/[password] schemas=monware dumpfile=expdat.dmp version=10.2
2. impdp wi/[password] schemas=monware dumpfile=expdat.dmp logfile=dumpw.log directory=[directory]

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