I am trying to create a new external content type using SharePoint Designer, whenever I am trying to add WCF connection I get an error message as "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information"

I am trying to add external content type to SharePoint Online using SPD 2013. enter image description here


To troubleshoot the issue, check things below:

  1. Close and re-open the SharePoint designer.

  2. Clear SharePoint designer cache according to the article below.

How to Clear Your SharePoint Designer 2010/2013 Cache.

  1. If the issue still exists, you could re-install the SharePoint designer.

Updated: I suggest you could submit a service request like the picture below.

enter image description here

  • I tried, still same issue. – Zaid May 24 '18 at 9:57
  • I have updated the reply. – Amy_MSFT May 28 '18 at 1:54

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