"su" error need help???

[mcclnx mcc <mcclnx@xxxxxxxxxxxx>]

I 'su" to root and run command.  I got error message. 
Anyone know how to fix it?

=====================================================

/home/app/oracle/product/oms10g/install/unix/scripts/omsstup
start
/bin/su: user %s_userName% does not exist


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