SAP Knowledge Base Article - Preview

2177353 - WDA: FATAL ERROR: Synchronous requests are not supported


  • When running a Web Dynpro ABAP Application, the following error is shown:
    • 'FATAL ERROR: Synchronous requests are not supported: /sap/public/bc/ur/nw7/js/classes/MessageBundle.js?...'
    • Besides, the page is blank and not loading.
  • Example screenshot:

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."



  • Web Dynpro ABAP
  • SAP NetWeaver
  • SAP NetWeaver Application Server for SAP S/4 HANA


SAP NetWeaver Application Server for SAP S/4HANA all versions ; SAP NetWeaver all versions


Web Dynpro; Webdynpro; Web Dynpro ABAP; WDA Javascript; Fehlermeldung von Webseite; Unified Rendering; unified rendering; UR; MessageBundle.js?; fatal error; WDA_GDPR , KBA , BC-WD-ABA , Web Dynpro ABAP , BC-WD-UR , Unified Rendering , BC-WD-ABA-REN , Rendering , BC-WD-ABA-RUN , Web Dynpro ABAP Runtime , Problem

About this page

This is a preview of a SAP Knowledge Base Article. Click more to access the full version on SAP for Me (Login required).

Search for additional results

Visit SAP Support Portal's SAP Notes and KBA Search.