**problem:** when running 'Real World Projection' - calibration fails and returns a message of ```"no aruco found" ``` **solution:** probably the camera is not focused well or there is not enough / too much light. - [ ] adjust the focus and light, make sure the captured images are good - [ ] run the 'Undistorted Camera' step (even if you already run it) - [ ] re-run 'Real World Projection'