Invoke code activity-How to run the activity that contain the System.Drawing.Point type?

Hi guys!
I am faceing the problem that if the Invoke Code Activity contain the System.Drawing.Point types,The workflow can’t run.
Imports namespace can’t find System.Drawing.Point,like below screenshot.

Browse and select type page can find System.Drawing.Point,like below screenshot.

when run the workflow,occur errors,but before run,it is no error hint by the invoke code activity,like below screenshot.

the source file like this.
Main.xaml (4.8 KB)
I am appreciate for any help!
Is it a Bug?
Best Regards!

I am trying to solve this problem,and is caused by my code,not by the uipath.

Add variable Type System.Drawing.Point.