so when i try to load a model i get an error saying: java.util.concurrent.CompletionException: java.io.FileNotFoundException: /storage/emulated/0/Android/data/net.kdt.pojavlaunch/files/custom_instances/haste/player_models/beelzebub.cpmproject (Permission dennied)

Have you tried storing the project file somewhere else? You've put it in the Android/data folder, which CPM doesn't have permissions to open.