I am trying to perform LULC prediction modelling on LULC maps prepared using LANDSAT 5 TM and LANDSAT 8 OLI images, in the Land Change Modeler in IDRISI Selva. I first converted Classified image format from .img to .ascii to .rst and then used it as input. However, whenever I try to run the model an error appears, saying "Earlier land cover image not found". How do I fix this error?