Managed server failed to start becuase of Failed to invoke startup class "JRF Startup Class", java.lang.ClassNotFoundException: oracle.jrf.wls.JRFStartup

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Environment Details:
Weblogic : 10.3.6
OSB : 11.1.1.7.0
OS : Windows 10

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Problem Summary:
Am using weblogic admin console to start managed server but unable to start managed server because of Failed to invoke startup class "JRF Startup Class", java.lang.ClassNotFoundException: oracle.jrf.wls.JRFStartup

Error:
<Oct 16, 2017 8:10:24 PM IST> <Notice> <Log Management> <BEA-170019> <The server log file C:\OraclePS6\Middleware\user_projects\domains\osb_domain\servers\osb_server1\logs\osb_server1.log is opened. All server side log events will be written to this file.>
<Oct 16, 2017 8:10:28 PM IST> <Notice> <Security> <BEA-090082> <Security initializing using security realm myrealm.>
<Oct 16, 2017 8:10:30 PM IST> <Critical> <WebLogicServer> <BEA-000286> <Failed to invoke startup class "JRF Startup Class", java.lang.ClassNotFoundException: oracle.jrf.wls.JRFStartup
java.lang.ClassNotFoundException: oracle.jrf.wls.JRFStartup
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)
Truncated. see log file for complete stacktrace
>

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Root Cause:
StartScriptEnabled is set to false in nodemanager.properties.

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Resolution:
1. Open C:\OraclePS6\Middleware\wlserver_10.3\common\nodemanager\nodemanager.properties on the managed server machine.
2. Set StartScriptEnabled=true.
3. Restart the node manager.
4. Stop the managed server.
5. Start the managed server from Admin console.