2396591 - 500 Internal Server Error when executing Role Upload (Role from Back End)

•  After clicking ‘Start Upload’ button of the Role Upload application, the following error occurs:
  
  500 Internal Server Error                                                                                                
  
  Failed to process request. Please contact your system administrator.
  
  

•  The following error can be found at the defaultTrace files:
  
  500 Internal Server Error is returned for HTTP request [http://<HOST>.<Domain>:<PORT>/webdynpro/resources/sap.com/pb/PageBuilder]:
    component [dispatcher],
    web module [webdynpro/resources/sap.com/tc~pp~admintls~role_upload_ui],
    application [sap.com/tc~pp~admintls~role_upload_ui],
    DC name [sap.com/tc~pp~admintls~role_upload_ui],
    CSN component[EP-PIN-PCD-ROL-UPL],
    problem categorization [],
    internal categorization [-1812969830].

  [EXCEPTION]
  java.lang.NullPointerException
   at java.util.Hashtable.put(Hashtable.java:394)
   at com.sap.roleupload.utils.MigrationHandling.startMigration(MigrationHandling.java:405)
   at com.sap.roleupload.ui.RoleUpload.upload(RoleUpload.java:538)
   at com.sap.roleupload.ui.wdp.InternalRoleUpload.upload(InternalRoleUpload.java:566)
   at com.sap.roleupload.ui.ExecuteUpload.wdDoInit(ExecuteUpload.java:118)
   at com.sap.roleupload.ui.wdp.InternalExecuteUpload.wdDoInit(InternalExecuteUpload.java:228)

SAP Netweaver Enterprise Portal.

Role, Upload, Exception, Error, 500, Internal, nullpointer, NullPointerException, null, , KBA , EP-PIN-PCD-ROL-UPL , Role upload from ERP , Problem