GIMP Version: 2.8.10
Operating System: Mac OS
OS Version: Yosemite
GIMP Experience: Beginner Level

List any ERROR messages you received:
Saving '/Users/m/Desktop/PaperBackLayout_FINAL_07-25-14-gimp.png' failed:

Error while saving '/Users/m/Desktop/PaperBackLayout_FINAL_07-25-14-gimp.png'. Could not save image.

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I'm having trouble exporting my cover file to a pdf. I had to resize it, which I did. Then I flattened the image. I keep getting this error message.

Saving '/Users/m/Desktop/PaperBackLayout_FINAL_07-25-14-gimp.png' failed:

Error while saving '/Users/m/Desktop/PaperBackLayout_FINAL_07-25-14-gimp.png'. Could not save image.

I haven't been able to export the file as anything IE. PDF, JPG, or other. It also will not allow me to export any of the previous saved copies without the resize. Is this because of OS Yosemite?

Can you save as XCF? Try that first and then export (select file type) as PDF.

Yeah I tried that... Same error message.

What is your work flow? Are you starting with a blank Gimp canvas?