ChangeCheckScope error

[CMDRFothergill]

Ref: E02 - Planet editor
while creatinng the Planet Editor GUI the line:
"using (var check = new EditorGUI.ChangeCheckScope())"
Keeps throwing back the error that the name "ChangeCCheckSCope" doesnt exist in the type "EditorGUI"
My code is identical to the code shown on screen, does anyone know a fix for this?

Update i accidently had an outdated Unity engine installed lmao