Post upgrade to 7.1.8 we received the following error in the pega logs. The source was determined as a "custom agent activity".

com.pega.pegarules.pub.generator.UnresolvedAssemblyError: Invalid class specified in Valid Classes
at com.pega.pegarules.priv.FUAUtil.throwUnresolvedAssemblyError(FUAUtil.java:423)
at com.pegarules.generated.activity.ra_action_populaterates_6df6571a187666a79bf77c7a2d1b8eab...
at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3500)
at com.pega.pegarules.session.internal.async.agent.QueueProcessor.runActivity(QueueProcessor.java:721)
at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:602)
at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:945)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1259)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1008)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:901)
at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:670)
at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1504)
at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1293)
at com.pega.pegarules.session.internal.async.AgentQueue.run(AgentQueue.java:792)
at com.pega.pegarules.session.internal.async.Agent.runAgentTask(Agent.java:936)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.processAsyncTask(AsyncServant.java:221)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.AsyncServant.invoke(AsyncServant.java:167)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:315)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:263)
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)
at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
at java.lang.reflect.Method.invoke(Method.java:620)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:367)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:408)

We used the SMA to reload the concerned activity rule and the issue was resolved.

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