The error you're encountering is likely due to a mismatch between the hotkeys defined in your hotkeys.txt file and the version of Spine you are using. This can happen if you have upgraded or downgraded your Spine version, as different versions may have different hotkey configurations. To resolve this issue, you can delete the hotkeys.txt file, which will be automatically recreated with default settings the next time you start Spine. This should eliminate the error message. If you prefer not to lose your custom hotkeys, you can back up the file before deleting it and then manually reapply your customizations after the file is recreated.
For more detailed steps, you can refer to the Spine User Guide on Hotkeys.
