Hello aerokade,
Seems like the shapes data has been corrupted in the project, so cannot be opened now.
To fix the problem, though to loos the shapes, you can manually edit doc.xml file in the frame.zip archive inside the project.files directory and remove the line related to the shapes in the end of the file.
Maybe you can also specify the area covered by this project and the parameters used for the contour generation (min, max, step values)?