import errors

All,

I have exported a schema successfully.  Now I am trying to import with a fromuser and touser.  Both schemas exist in the database and have for years.  I am using my dba login to do this.  Here is the error I am getting

IMP-00003: ORACLE error 1435 encountered
ORA-01435: user does not exist
Import terminated successfully with warnings.

my import syntax is:

Imp dba_login/password@instancename file=bkup_03032011.dmp log=restore_bkup_03032011.log buffer=1000000 commit = y analyze=n fromuser = abc touser= cde;

I exported without issue.  I am running this from a command line.

What am I doing wrong please?