How to import the MapBox component into a UI Builder page problem

I tried to make custom funcion “loadCSSwithURL” and in step 8 (Paste the following code into the editor)
i have error when paste code in code editor

Hello @Nikola_Vojinovic

Could you save the function with this warning?
Is it doesn’t work in the app? Or may it trigger some errors in run time?

Regards, Dima