An error occurs when vortex2d. Net creates a node before screenmanager.

When you plan to use vortex2d to display the graphic data stored in the database, you plan to create a node list and add the previously designed graph to the node list based on the graphic data in the database, then, it is displayed when vortex2d is displayed. When I have not created a screenmanager, I first create a Node object, and then initialize vortex2d when the form is displayed, and run the following command to: sender. _ graphscreen = new screenmanager (sender. _ targetcontext, sender. mouse, keyboard);, the system prompts a type error. Once you cancel CodeAnd everything is as usual. Therefore, it is determined that the node and its subclass objects cannot be created before the screenmanager is created.