# Can yall please help me **URL:** \ **Category:** Help\ **Created:** [November 25, 2025, 6:38am UTC](https://forum.makecode.com/t/can-yall-please-help-me/40652 "2025-11-25T06:38:32Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![AlexK](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/alexk/32/33339_2.png) [@AlexK](https://forum.makecode.com/u/AlexK)\ **Post date:** [November 25, 2025, 6:50pm UTC](https://forum.makecode.com/t/can-yall-please-help-me/40652/5 "2025-11-25T18:50:57Z")
Use the debugger to understand your code better and to get at the source of your new error. > [@Program error: sim error: failed cast on null](https://forum.makecode.com/t/program-error-sim-error-failed-cast-on-null/28831/2): > > Hi, @ruprion ! Whenever I get an error like this, especially when the error is repeatable (meaning, I know when the error will happen), then I often use the debugger to show me where the problem is. To turn on the debugger, select the debug button below the game controls. Screenshot below. [Debug button highlighted beneath the MakeCode Arcade simulator] When I run the debugger on your program and select the A button after the attract screen, the debugger highlights this block inside of your o… More than likely, one of your `ItemX()` functions is trying to work with a sprite that has not yet been created. --- _[View the full topic](https://forum.makecode.com/t/can-yall-please-help-me/40652)._