opatchauto command results in java.lang.NoClassDefFoundError: oracle/oplan/sdk/intg/OPlanIntgFactory
I have a Enterprise Manager 12c 12.1.0.3 version.
Any opatchauto command such as "opatchauto lspatches" or "opatchauto apply" results in the below error.
$>./opatchauto lspatches
java.lang.NoClassDefFoundError: oracle/oplan/sdk/intg/OPlanIntgFactory
at oracle.opatchauto.oms.OMSPatchingSession.<clinit>(OMSPatchingSession.java:61)
at oracle.opatchauto.oms.OPatchAuto.<clinit>(OPatchAuto.java:87)
Caused by: java.lang.ClassNotFoundException: oracle.oplan.sdk.intg.OPlanIntgFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)