Lightburn keep busy after alter arduino code

Hi, i have a problem with my lightburn software keep busy after sending a signal such as moving and others, few min before i alter the arduino code it was fine, the code that i change is the homing for x and y axis only, i was having trouble to set homing and keep getting alarm 9, so i think it must be because the normal code for grbl it will clear Z axis first then x and y axis for homing, after changing the code deleting the Z axis on arduino config.h it suddenly keep busy when i try to move my laser? Im using grbl 1.1h, thanks