Project wont open just get a black screen

my university project which is in a .vpp file wont open I just get black screen and has untitled at the top.
Was working on it all day and it was working fine just stopped working
anyone know how to solve this problem

Would you please send your project file to support@visual-paradigm.com so that we can help you to check on it? Look forward to hearing from you.

Best regards,
Rain Wong