Where is your project saved to? And, what are the save location(s) for the Scratch Disks. See Edit Menu/Preferences/Scratch Disks.
Let us go through the drill...
a. What is the project preset?
b. What are the properties of the source media?
c. What are you exact export settings for save to file or burn to disc?
But, first look to permissions including deletion of the Adobe Premiere Elements Prefs file which I believe can be found on Mac
Libraries\Application Support\Adobe\Premiere Elements\13.0. Also think about clearing the Media Cache Files Folder and the Adobe Premiere Elements Preview Files Folder.
My project is saved to document>adobe>premiere elements>13.0
I don't seem to have a preferences file.
I cleared the media cache folder and the preview files folder.
Can I just re download Premiere Elements? Will that fix everything?
Regarding Scratch Disks message....
Are all your scratch disks directed to the 13.0 Folder where the project file (.prel) is saved? How much free space is at the scratch disks save locations? If 89 GB?
As for a Premiere Elements Editor settings file (preferences), do you have a folder option named Show Hidden Files, Folders, and Drives disabled. Explore that as the reason for not finding the Adobe Premiere Elements Prefs file.
If all else does not resolved the problem, then go for
free ccleaner run through Piriform - CCleaner Mac
But we will be keeping the following in mind if that does not resolve the issue.
Because of your issue with generating an export, we cannot rule out video properties and project settings. In this regard,
a. Do you confirm that you have QuickTime 7 latest version installed along with Premiere Elements on your computer
b. You are running the programs as administrator
c. What is the brand/model/settings of the camera that recorded your video (what file extension)
d. What is your project settings
e. Where on the computer are you storing the files that you are importing as source media into your project?