2495384 - Not authorized to execute this action error while launching BPM task

When you try to launch the BPM task it throws the below error in portal and also you can see the below Caused by in the default trace:

Caused by: com.sap.bpem.auth.AuthorizationRuntimeException: Failed to execute Query. 
at com.sap.bpem.auth.AuthorizationManager.checkUserAuthorization(AuthorizationManager.java:122) 

Caused by: com.sap.bpem.index.exception.RegistryException: No SearchHelper found for searchable item class com.sap.bpem.auth.IAuthorizationObject! 
at com.sap.bpem.index.query.QueryManagerBean.createQueryContainer(QueryManagerBean.java:100) 

• SAP NetWeaver Business Process Management (BPM)
• SAP NetWeaver Application Server Java

Enterprise Portal 7.0, EP 7.0, Enterprise Portal 7.01, EP 7.01, Enterprise Portal 7.02, EP 7.02, Enterprise Portal 7.03, EP 7.03, Enterprise Portal 7.1, EP 7.1, Enterprise Portal 7.2, EP 7.2, Enterprise Portal 7.30, EP 7.30, Enterprise Portal 7.31, EP 7.31, Enterprise Portal 7.40, EP 7.4 , KBA , BC-BMT-BPM-DSK , Process Desk , Problem