autodesk.autocad.interop 18.2.0.0 error

Hi,

I am having a problem with my Autocad 2012. I am trying to add a button trough the "customize user interface" (dragging a button from the list to the work space) and as soon as my mouse leaves the user intercace, the following error comes up:

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Now, some (maybe) important information : This computer is also running Microvellum Toolbox 67.

Any idea?

Thank you,

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Image may be NSFW.
Clik here to view.