Configuration Main Class and file not found errors

Hello, I am a trying to set up Forge for intelliJ and the tutorial that I am following has us create a configuration with a couple of different features (skin and uuid) but when I try to do what he does and type in GradleStart, it turns red. I tried doing what he said and refreshing gradle, but it still does not work, so I think it may be horribly wrong as he suggests. Some people in the comments say it still runs when it is red, but when I try to run it, I get the message:

Error:Cannot run program "C:\Program Files\Java\jdk-10.0.2\bin\java.exe" (in directory "C:\Users\USER\.IdeaIC2018.2\system\compile-server"): CreateProcess error=2, The system cannot find the file specified

I have tried looking this up, but to no avail. I would be grateful for any help!

Thank you