Getting error while opening project

hey developers, i am getting this error each and every time i open screen1 and also if i try to change the screen blocks its not saving it even i try to save it with save option in file section any solution ?

The blocks area did not load properly. Changes to the blocks for screen 6410363092336640_Screen1 will not be saved.

Here is my aia file :

project.aia (4.1 MB)