Error with OWM in EBS R12.2.6

When i am starting the oracle wallet manager in EBS R12.2.6 version below error appears.

Any one come across this type of issue.

DB version 12.1.0.2

OS  :EL6

[appldev@dacydd certs]$ owm &

[1] 6786

[appldev@dacydd certs]$ Exiting

java.lang.NullPointerException

        at oracle.ewt.lwAWT.BufferedApplet.<init>(Unknown Source)

        at oracle.sysman.emSDK.client.appContainer.WebApplication.<init>(WebApplication.java:752)

        at oracle.security.admin.wltmgr.owma.OwmaApp.<init>(Unknown Source)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

        at java.lang.Class.newInstance(Class.java:383)