Function Referancing

Hello

I was wondering if someone might be able to give me some information or help in regards to calling a functions class from another function. Although the things is the function only has the start and update in it with its code.
The scripts are for a pinball project. I have set this up for the menu’s but for the flippers and plunger i can not get them working as how they have been coded any pointers in how I should adjust the code accordingly would help I can drop the file respectfully if needed

Please post your code using Code tags, and the exact error message and line number for us.