How to fix missing definitions?

I wrote Debug.log("test"); into Microsoft visual studio, however both the studio and unity say 'Debug' does not contain a definition for 'log', have i just written something wrong?

 

Have you checked the online documentation to see if the Debug class has a function called log?

https://docs.unity3d.com/ScriptReference/Debug.html

HINT: C# is case sensitive.

 

Maybe you can post the entire script (please use code tags). We can then check if you have included all the necessary units.