Error: PPAbstractTracer a problem occurred while accessing addResponseCookie: weblogic.servlet.internal.ServletResponseImpl setStatus

Document ID : KB000094186
Last Modified Date : 26/06/2018
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Issue:
We are seeing following error in the IntroscopeAgent.log when Browser Agent is enabled:

[DEBUG] [IntroscopeAgent.Agent] Error: PPAbstractTracer a problem occurred while accessing addResponseCookie: weblogic.servlet.internal.ServletResponseImpl setStatus java.lang.NoSuchMethodError: com.wily.introscope.agent.trace.BTThreadLocalAdministrator.getCookieMaxAge()

What does it imply and how to fix it?
Environment:
CA APM Introscope Agent 10.3.0.15 Build: 990015
Cause:
This was due to incompatibility of the Agent.jar and the BrowserAgentEx.jar used in the agent directory. The Agent.jar was from 10.3 HF#18, and the BrowserAgentEx.jar used was from a desktop fix provided along with its matching version of Agent.jar to address a separate issue.
Resolution:
Revert to using the default BrowserAgentEx.jar from 10.3 and the Agent.jar from 10.3 HF#18.