Hello! what Photoshop version and script version are you using?

Please make sure to be using the latest from here:
spine-scripts/photoshop at master · EsotericSoftware/spine-scripts

Here's a video to help you setup the Photoshop file nicely:

If you still encounter problems try sending us your psd and a screenshot of your export settings to contact@esotericsoftware.com so we can try to reproduce it.