Hello mappers! I am very new to the mapping scene. I started making a map and it looks like a cross with zombies supposed to be coming from the left right and bottom, but at the top are all the perks + PAP + mystery box. The main goal is to get enough for the buyable ending, located at the top as well. I implented i think everything that i need and did what i wanted, but im getting an error while trying to startup the map to check it out. It says UI Error 41437(as visible in image below).
Can anyone help me with the fix? And after it is fixed may i receive help in finishing my map? This is my first map and i cant find any answers to my error and i appreciate anyone who tries to help.


^that is the error i get^