Hello,
the errors shown in the screenshot are related to the fact that new hotkeys were introduced in more recent versions of Spine that are not recognized by the older version.
Delete the hotkeys file so that the next time you start Spine, the file will be recreated without the new entries. This will stop showing these errors.
The errors, however, are not related to any export problem. for that you need to post your log after trying to export.
Settings - Spine User Guide: Hotkeys
