ORA-27140 error after creating another user

I am a newbie in Oracle. Recently, I did an installation of Oracle 10g on an AIX 10.2.0 machine using user 'oracle.' Everything was running fine using 'oracle' until I created another user, i.e., ora1 to login. I received the following error: 
SQL*Plus: Release 10.2.0.1.0 - Production on Sun May 8 15:04:43 2005
Copyright (c) 1982, 2005, Oracle.  All rights reserved.

ERROR:
ORA-27140: attach to post/wait facility failed
I have browsed other sites for help but still am not able to solve it.

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After you installed Oracle, did you run the $ORACLE_HOME/root.sh script as the root user? If after running this script, you still have a problem, then do the following: 

cd $ORACLE_HOME/bin
ls -l oracle

Your permissions should appear as follows: 

-rwsr-s--x 61M Jun 21 2005 oracle

If not, then issue the following as 'oracle': 

chmod 6751 oracle

This was first published in May 2006

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