gradlew build command in cmd runs into arror

[McCheesy999]

I'm having troubles trying to export my mod I've just created. Btw, I'm working on a 1.7.10 mod if that helps so my eclipse isnt fully up to date. This is the error I'm getting

C:\Users\Noah\Desktop\eclipse>gradlew build
'gradlew' is not recognized as an internal or external command,
operable program or batch file.