Trial License

My license expired today but it says I can still view my saved files. when I try to open rhino this message pops up “Object reference not set to an instance of an object”. What does that mean and how can I still use view my files without buying a license after it expires?

Hi - we are trying to figure out what that means.
Please follow the steps outlined in this post and send the RhinoDebugMessages.txt file to @brian