Tech Note - Could not load file of assembly - Error 0x80131515

Owned by Luís Silvério
Last updated: Dec 22, 2023

Issue

  • The following error is displayed to a user when they try to load CardExchange® Producer with a plugin in dll format.

error : Could not load file or assembly 'file:///C:\foobar.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)

 

Solution

  • Guide the user to unblock the dll file by:

    • Right-clicking on the dll file

    • Selecting Properties

    • On the bottom right corner, click in Unblock

    • If prompted, confirm/approve the action

 

Causality

  • Due to security policies native to Windows, downloaded dll files are by default blocked by the operating system, having the users to manually unblock said files in order to be able to use them.