Blender export error.

[OngaaftheUnliving]

I recently made a pair of boots to go with an armour mod that I have made. I feel that I rigged them properly and their UV map appears to be correct but when I attempt to export I have this error, Image will be included,

Any insight to a potential explanation for this error is greatly appreciated!

[someone]

You are using a very old version of the plugin. That error was fixed a long time ago. See the blender topic for downloads.

[OngaaftheUnliving]

Thank you!