What software are you using? PS version. OS version etc. Also check you have all the updates for your version of Photoshop installed. That your only selecting image files to be stitched. That a javsscript error message from one of the Stack Script Only that get used when you use Photoshop Photomerge Script.
First of all thank you.
- mac OS X 10.9.2
- Adobe Photoshop Version: 14.2.1 x64
the update is OK