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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Control Add-In instant...
Small and medium business | Business Central, N...
Suggested Answer

Control Add-In instantiation error – but not for all users

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Posted on by CU15071722-0 29

Hello everyone,

 

We are experiencing an issue where some users see the following error:

 

"The control add-in for the control … on … could not be instantiated because of an AL error."

 

Interestingly, not all users are affected, even though they have the same permissions and roles assigned.

 

Has anyone seen this behavior before?


  • What could cause the add-in to fail only for some users?

  • Are there additional browser or client-side settings that might block the add-in from loading?


    •  

Any insights, suggestions, or troubleshooting tips would be greatly appreciated.

 

Thank you in advance!

Categories:
Dynamics 365 Business Central
I have the same question (1)
  • Suggested answer
    Sohail Ahmed Profile Picture
    Sohail Ahmed 11,169 Super User 2026 Season 1 on at
    As of my understanding/knowledge, this usually happens when the control add-in can’t load in the user’s browser session. Even with the same roles, differences like cached data, browser extensions, pop-up blockers, or missing permissions (media/download) can block the add-in.
     
    Try clearing the browser cache, testing in a different browser, and confirming the affected users have the same permission sets (especially if the add-in accesses external resources). If it works for some and not others, it’s often client-side rather than AL code.
     
    Maybe other experts can have better solutions for your query. ✅ Mark this as the verified answer if helpful.
     
     
  • Suggested answer
    Ramesh Kumar Profile Picture
    Ramesh Kumar 7,547 Super User 2026 Season 1 on at
    page tried to instantiate the control add-in but something failed on the AL/packaging side or the browser blocked a resource. Please cache this could Extensions: ad blockers, privacy tools, antivirus web shields. Disable and retry
     
    Thanks
    Ramesh
     
    If this was helpful, please check the "Does this answer your question?" box and mark it as verified.
  • Suggested answer
    Khushbu Rajvi. Profile Picture
    Khushbu Rajvi. 22,130 Super User 2026 Season 1 on at
  • Suggested answer
    Sumit Singh Profile Picture
    Sumit Singh 11,757 Super User 2026 Season 1 on at
    Hi, 
     

    You can try:-

    • Ensure users use supported browsers and allow:
      • JavaScript
      • Cookies
      • Pop-ups from Business Central
    • Check control add-in configuration in AL (scripts, stylesheets, startup logic).
    • Use Application Insights telemetry to analyze which users and environments are affected.
    1. Telemetry for Control Add-in Exceptions [3]
    2. Browser Setup for Business Central [1]
    3. Control Add-in Object Configuration [2]
    Note: This answer is based on my understanding, with Microsoft Copilot helping me organize and polish the wording.
    Mark the Boolean true “Does this answer your Question” if this was Helpful.

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