Cannot open form in design mode in Visual Studio

This has been an on-going issuefor years, which I can normally get around by opening, closing, cleaning, compiling the project until the RenderContentUserControlCollapsibleSection form will finally open. But now I am stuck and I absolutely cannot open my form in Visual Studio. The project compiles without error.

namespace PhysicalcSoftware.OctaneRender.RhinoPlugin
{
    [System.Runtime.InteropServices.Guid("25DA894E-91E4-4866-8426-47662116AC45")]
    public partial class OctaneMaterialTreeControl : RhinoWindows.Controls.RenderContentUserControlCollapsibleSection
    { // etc

error_vs973×397 19.9 KB

Thanks

Paul

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