Warning: The Office Extensibility Library failed to load

Created by Damien Zwillinger, Modified on Tue, 7 Nov, 2023 at 8:03 PM by Damien Zwillinger

Applies to:

  • Velixo NX
  • Every ERP



When starting Excel with Velixo NX, the following message is displayed in the Velixo NX side panel:


Text from Message:



The Office Extensibility Library failed to load.

Please reload the add-in by right-clicking this panel and pressing 'refresh', 'reload' or 'reload frame'.




This is a known Microsoft issue that occasionally happens with Office for Mac, Office Online, or Office for Windows.



By reloading the Velixo add-in, you can typically force Excel re-try to load the Microsoft Office Extensibility Library that the add-in requires.


Method 1

First of all, completely shutting down all instances of Excel and then re-starting Excel should work for all editions.


Method 2

Alternately, the methods used to do this vary slightly depending upon the edition and version of Excel.  


Excel for Mac or Excel Online

You can try right clicking within the Velixo NX panel and choosing refresh, reload, or reload frame (the exact wording can vary from version to version).




Excel for Windows

You can click the left-pointing arrow in the upper right corner of the Velixo NX side panel, and select Reload:


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