RTI failure on crop page in FAQ Posted August 30, 2017 · Report reply just ran the image sequence for the object in the newly downloaded RTI builder software. when I got to the crop page, I was unable to find the PTMFitter Location - all that comes up are Windows folders - I am unable to access the Mac side of my Applications folder. so, I moved the PTM Fitter to the desktop and used that location. the program ran fine until it got to row 4416. it always stops on row 4416. and then the pop-up window came up and it says: "Unknown error detected!" I will have to suspend the RTI photography for now - I still have seventeen objects to go and I am not sure what to do - thank you for your help!