I think this may be because I haven't installed this properly - the instructions are rather sparse. I have simply extracted the files into a directory under Documents, copied the demo spreadsheet into the 64-bit sub-directory (as this is a 64-bit Windows 10 machine) and run it from there - is that right?
The above error is on line: filePath = gDll.DLL.Graphics.SaveClipboardToImage("", "", "") in Sub btnSaveClipboard()
(I had to comment out a number of lines in the demo code that raised compile errors but I don't think it gets to any of them...)