.swf wont export (finishes at 0%)

Hi, I am a flash animator who is experimenting with toonbooms animation process.

I picked up with a free trial today Toonboom Harmony Essentials. However, when I attempt to export my work as an .swf it will stop at the 0% mark and say it is finished (all 291 frames are present when export if finished, but the image isn’t present and the .swf file size is incredibly small 611 bytes).
However when I export my work as an image or movie format it is fine and the images play out.

0percent

I have played with toonboom in the near past and these issues have never occurred.

If there is any additional information I required to help trouble shoot this issue I will gladly provide.

Thank you