How did you save it?
Are you trying to open a project file in Pre El or in a player?
How are you trying to open it?
What operating system?
What version of Pre El?
What version of Premiere Elements are you using and on what computer operating system is it running?
Did you move, delete, or rename any of the folders and files that you used in the project before the save close of the project?
Can you open a new project?
How are you attempting to open this previously saved closed project? Please give the details just so I can make sure that you are
not trying to open your project file (project.prel) in another project file (project.prel). Please excuse the question, but I do not know your
background in using the program and I do not want to take anything for granted.
Let us start here and then decide what next.
We may not need it, but, just in case, I will post the link to the Adobe document on troubleshooting damaged projects.http://helpx.adobe.com/premiere-elements/kb/troubleshoot-damaged-projects-premiere-element s.html
Looking forward to your follow up.