Observe: no window created; process returns to prompt with no visible UI.Need Assistance on Ui visibility on my julia code

I created a boid simulation using julia and the pkgs i used were Gamezero and Colors, but i cant view my code and i dont know what is wrong with it, i’ve hosted it on my github and here is the repo link GitHub - adrian-254/boid-simulation … further problem definition is on the readme file. Any assistance will be highly appreciated