1805793 - Registering diagnostic agent cannot find com.sap.smd.setup.SetupMaintenance - java.lang.NoClassDefFoundError

• Registering diagnostic agent with smdsetup.sh script fails with following error
• "Exception in thread "main" java.lang.NoClassDefFoundError:
  com/sap/smd/setup/SetupMaintenance
  Caused by: java.lang.ClassNotFoundException:
  com.sap.smd.setup.SetupMaintenance

          at java.net.URLClassLoader$1.run(URLClassLoader.java:263)

          at java.security.AccessController.doPrivileged(Native Method)

          at java.net.URLClassLoader.findClass(URLClassLoader.java:251)

          at java.lang.ClassLoader.loadClass(ClassLoader.java:361)

          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:344)

          at java.lang.ClassLoader.loadClass(ClassLoader.java:302)

  Could not find the main class: com.sap.smd.setup.SetupMaintenance.
  Program will exit."

KBA , SV-SMG-DIA-SRV-AGT , Agent Framework , Problem