I got the same problem. When I opened the debug console, it shows this message:
[ERROR]03:07:21: Exception has occurred while running! Please report error to developer if problem persists: java.lang.NullPointerException at org.dreambot.api.wrappers.interactive.model.PlayerModel.getModelFromCache(PlayerModel.java:43) at org.dreambot.api.wrappers.interactive.model.PlayerModel.<init>(PlayerModel.java:23) at org.dreambot.api.wrappers.interactive.Player.getModel(Player.java:81) at org.dreambot.api.wrappers.interactive.Entity.isOnScreen(Entity.java:49) at main.Main.onLoop(Unknown Source) at org.dreambot.api.script.AbstractScript.run(AbstractScript.java:238) at java.lang.Thread.run(Unknown Source)
Hope you can take some time to look into this. Thanks