2386522 - Error: "Post-processing plugin failure! Cannot instantiate plugin class test.SafetyExtension. (FBE60208)" when scheduling publication with post processing plugin

Scheduling publication with Post Procesing Plugin fails with error:

ERROR [PublishingService:RunInstancePool-153] BusinessObjects_PublicationAdminLog_Instance_222651 - [Publication ID # 222651] - Post-processing plugin failure! Cannot instantiate plugin class test.SafetyExtension. (FBE60208)

java.lang.ClassNotFoundException: SafetyExtension

at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)

at java.lang.ClassLoader.loadClass(ClassLoader.java:426)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forNameFW(Class.java:357)

at java.lang.Class.forName(Class.java:265)

at com.businessobjects.publisher.processing.ProcessingMain.runInstanceThreadProc(ProcessingMain.java:534)

at com.businessobjects.publisher.processing.ProcessingMain$2.run(ProcessingMain.java:190)

at com.businessobjects.publisher.processing.threadpool.TraceLogRunnableWrapper.run(TraceLogRunnableWrapper.java:29)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:812)

SAP BusinessObjects Business Intelligence platform 4.2

plugin, publication, fbe60208, java.lang.ClassNotFoundException, SafetyExtension   , KBA , BI-DEV-JAV , BI Software Development Kits (SDKs) - Java , Problem