Not connected to PL/SQL Developer

Hi,
I am using oracle9i and solaris 8.i created a database in the server .. if i open the database in the pl/sql developer it shows error as
ORA-01034: ORACLE not available
ORA-27123: unable to attach to shared memory segment
SVR4 Error: 13: Permission denied
. But the same database is accessed by other user near by me using pl/sql developer ... what is the solution for this...

a normal user.What is a "normal user"?
Me also try the same but receiving the error.Well perhaps the system just hates you.
Please provide the solutions We don't know the solution. There is a problem in your set-up. You need to compare your config files, etc with your more successful colleague and diagnose the problem. We cannot do this for you.
Regards, APC

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