Skyrim modding help, unable to compile script when making MCM

[THeLostMaze]

So, if I understood correctly, I need some files from SkyUI SDK, I installed version 5.1.
The first step that it shows is to make a new quest and add a script to it. I did. Then you need to change the extends Quest to extends SKI_ConfigBase. I did so, this does not what to compile, due to being unable to find the script SKI_ConfigBase. 
I did add the scripts into my data folder and put them in the correct location, there is a screenshot below, but it can't find it. I checked if it was a directory issue, but that does not seem the case, as the next script below that, in this case ActiveMagicEffect is recognized and if I change it to extends ActiveMagicEffect it does compile. Does anyone have any ideas why that might be?