I am getting a [Missing] icon for a toolbar using ArcObjects. I have never seen this before and cant find any information on it.

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The custom extension that is this tool bar was written in VB.Net using ArcObjects. I am currently trying to migrate the program to work in 10.5

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    There's a good chance that ArcMap can't find the tool, check the addin manager folder that it's pointing to. If the .esriaddin file is in that folder already then open the tool in Visual Studio, ensure the .net version matches 10.5 (4.5 desktop.arcgis.com/en/system-requirements/10.5/…) and that the references aren't marked specific version then rebuild, clear your assembly cache (%USERPROFILE%\AppData\Local\ESRI\Desktop10.5\AssemblyCache\ presumably) and see if that makes it show up – Michael Stimson Mar 20 '19 at 1:04

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