2492735 - Portal AJAX Theme Studio does not open due to Error 500

• You are trying to generate a new theme using the AJAX Theme Studio application
• After selecting a desired colour scheme and clicking the Done button, an 500 Internal Server Error is displayed
• Checking the developer/Default Trace exceptions you observe the following error:
  "Error: 500 Internal Server Error is returned for HTTP request [http://<host>:<port>/webdynpro/resources/sap.com/pb/PageBuilder]:
• component [dispatcher],
  web module [webdynpro/resources/sap.com/tc~pp~support~themestudio],
  application [sap.com/tc~pp~support~themestudio],
  DC name [sap.com/tc~pp~support~themestudio],
  CSN component[EP-PIN-TOL-STY],
  problem categorization [],
  internal categorization [-811472838].
  [EXCEPTION]
  java.lang.NullPointerException: while trying to invoke the method com.sapportals.portal.design.IPortalPortalDesignDataManager.getDesignInfo(java.lang.String) of a null object loaded from local variable 'designDataManager'
  at com.sapportals.portal.design.DesignService.exportDesignByID(DesignService.java:2145)"

• SAP NetWeaver Application Server for Java 7.3x and higher releases
• Enterprise Portal 

theme, editor, theming, color, colors, colour, colours, preview, exception, runtime, error, 500, internal, server, error, laf, less, uitd, UI, Theme, Designer, tc~pp~support~themestudio , KBA , EP-PIN-TOL , Themes / Portal UI Theme Designer / Theme Editor , EP-PIN-PRT , Portal Runtime , CA-UI2-THD , Theme Designer , EP-PIN-NAV-AFP , Ajax Framework Page , EP-PIN-TOL-STY , Use EP-PIN-TOL , Problem