Concurrent request that output to PDF fail with REP-3000: Internal error starting Oracle Toolkit on soalries.

The Error  " REP-3000: Internal error starting Oracle Toolkit." was occurring in our development server and it may occur in any server.

In my case everything was set correct and i did all the checks for the parameter "DISPLAY" value .
The root cause :

cserpdbd1:applmgr>ps -ef | grep twm
 applmgr  1620  1173   0 11:18:12 pts/6       0:00 grep twm
cserpdbd1:applmgr>ps -ef | grep -i xvfb
    root 29861     1   0 11:00:38 pts/3       0:00 /usr/bin/ksh /etc/init.d/Xvfb_start_stop_rc start

As you can see that the process twm was dead and starting the process fixed the issue.

Solution:

starting the twm process fixed the issue.