fix: test object type before executing

src/solstice/export_constraint.py

@@ -90,6 +90,11 @@ class ExportConstraint(bpy.types.Operator):
     filepath: bpy.props.StringProperty()
 
     def execute(self, context):
+        # Assert the selected file is a bone
+        if context.active_object.type != 'ARMATURE':
+            self.report({'ERROR'}, "Active object is not an armature.")
+            return {'CANCELLED'}
+
         # Do something with the selected file path
         print("Selected file:", self.filepath)
         # Call the function or perform the desired actions using the file path