Problems with VS19 ToolBox framework 4.5.2

Question

I have a .Dll project full of Controls for Winforms: Platform : x86 .Net Framework : 4.5.2

Since yesterday it started to have problems when i add it to the toolbox of any other project with the same .Net framework version. It won't let me use it in the Designer

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This message show up every time i try to add it to the ToolBox

2 days ago everything was fine and it worked in the Designer, i could drag and drop all the Controls in the .Dll

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Something strange is that i can still use all the controls from code by typing:

var ctrl = new CustomControls()....
this.Controls.Add(ctrl)

It's just the toolBox that sucks.

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I already tried:

• Restarting VS
• Rebuild Dll and other project
• Reset ToolBox
• Delete and Add the Dll to project References

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PS: yestarday I updated w11 update, and it was refeating to .Net framework

Restarting VS Rebuild Dll and other project Reset ToolBox Delete and Add the Dll to project References