Command could not complete using Paint Shop Pro 8

Hello whiz,
I have Paint Shop Pro 8 in my windows 8 64 bit operating system. All of a sudden I am getting this error message. The message states that the command could not complete because it requires a view on the active document. How to rectify this error? Do I need to re-install the Paint Shop Pro 8? Please help me. Thank you.

Command could not complete because it requires a view on the active document.
