cant start enterprice manager

i canot have to start enterprice manager

error is specified below...please help me( software:Oracle 10g ...platform:ReHat EL-5)



TZ set to Africa/Khartoum
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://localhost.localdomain:1158/em...outApplication

Timezone mismatch: The agentTZRegion value (Africa/Khartoum) in
/u01/app/oracle/product/10.1.0/db_1/localhost.localdomain_cargo/sysman/config/emd.properties
does not match the current environment TZ setting(Africa/Khartoum).
The dbconsole cannot run with this mismatch.

If Africa/Khartoum is the correct timezone, set your timezone environment variable to Africa/Khartoum and repeat the 'emctl start dbconsole' operation.

If Africa/Khartoum is not the correct timezone, make sure that the timezone in your environment is correct, and then run the following command in your local Oracle Home: 'emctl resetTZ agent'

The output of this command will include detailed instructions to follow, to correct the mismatch.