I'm trying to set up a modding eviroment with forge-1.7.10-10.13.4.1614-1.7.10-src. I'm completely new to modding so I'm not sure why I have to do any of this I'm folling a guide I found online here: https://blog.usejournal.com/a-beginners-guide-to-modding-minecraft-9a42536495f6. When I try to run any .\gradlew command I get this message in the attached file.
I've seen some forum posts suggesting to upgrade gradle but I've no idea how to do that. Any help would be appriciated.