I've just tried it on a dev machine with no issues. Running VS 2019 v16.7.6, with Sage 300 2020 PU2.

I created a new c# .NET win forms app. Changed the target type to x86. Created a new form. In the toolbox I added the AP2100 control and dragged it in. It automatically referenced accpacCOMAPI, the datasource, etc. All that can be seen from the screen shot below. No issues.

I have a few projects on Sage300 2019 using WPF with sage finder controls working all ok.

Can i suggest that you check the target type is x68 and clear your obj and bin folders - then clear your solution.

The only issues I've encountered is when upgrading projects to later versions of Sage300. I basically have to remove all references that are auto-created, clear the solution (and delete the the obj and bin folders), then add the updated controls to the toolbox and drag them into a dummy form. It automatically add all new references and updates the existing controls.

All my application are x86. Already tried to clear the obj and bin folder but still no luck, also creating new project still having the ActiveX error. Next I will try to upgrade to PU2. Thanks for the input.

maybe even try running VS under admin elevation?

maybe even try running VS under admin elevation?

Running my VS as admin still throwing same error.