fixed the spin goal by removing i

src/rovr_control/rovr_control/calibrate_field_coordinate_server.py

@@ -42,9 +42,10 @@ def execute_callback(self, goal_handle: ServerGoalHandle):
             self.get_logger().error("Nav2 service not available")
             return result
 
-        for i in range(1, 3):
+        spin_attempts = 2
+        for i in range(spin_attempts):
             # Spin around to find the apriltag
-            spin_goal = Spin.Goal(target_yaw=(i * math.pi))
+            spin_goal = Spin.Goal(target_yaw=math.pi)
             spin_request = self.cli_spin.send_goal_async(spin_goal)
             rclpy.spin_until_future_complete(self, spin_request)
             spin_handle: ClientGoalHandle = spin_request.result()
@@ -69,7 +70,7 @@ def execute_callback(self, goal_handle: ServerGoalHandle):
                 self.future_spin.cancel()
                 rclpy.spin_until_future_complete(self, self.future_spin)
                 break
-            elif i == 2:
+            elif i == spin_attempts-1:
                 self.get_logger().error("Failed to find apriltag")
                 return result