adhoc approver in HRMS Errors- oracle.apps.ame.dynamicapprovals.server.ApprovalsAMImpl.addApprover

Error:

When we add Adhoc approver in the Oracle HRMS system getting below error.

Detail 0
java.lang.NullPointerException
        at oracle.apps.ame.dynamicapprovals.server.ApprovalsAMImpl.addApprover(ApprovalsAMImpl.java:1088)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:190)
        at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:133)
        at oracle.apps.fnd.framework.server.OAApplicationModuleImpl.invokeMethod(OAApplicationModuleImpl.java:797)
        at oracle.apps.ame.dynamicapprovals.webui.ApprovalsCO.processFormRequest(ApprovalsCO.java:101)
        at oracle.apps.fnd.framework.webui.AWebBeanHelper.processFormRequest(OAWebBeanHelper.java:819)
        at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:385)


Solution:
Check all approvers in the approval chain and no one terminated and with end date

Ref: 
Adding Adhoc Approver to Offer Approvals Produces NullPointerException Error (Doc ID 459730.1)