When you have Discoverer and EBS running on the same machine, this kind of conflicts may happen.
To resolve,
Start another session, clear All Environment Variables, restart the Web-logic Server Again.
This will resolve the issue. For More Info, Refer
| Unable to Access Discoverer Plus/Viewer 11g Installed On Server Having EBS 11i / R12 (Doc ID 1338244.1) |
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Sriram Sanka
Hi there, This is SCP Ranga Rao Sanka working as (A product Manager/Principal DBA)., I have a broad range of Experience in Administration and Implementation in the areas of Database, Cloud, and Other Servers. I am one of the moderators at ORAFAQ. The primary purpose of this blog is to share knowledge.
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Sriram Sanka 
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