Communication with Notification Centre Course - Compiler Error

[entropy_nz]

Hi, when I run the game I get the error message -

Assets/Plugins/PlayerPrefs.cs(224,51): error CS0117: `System.IO.File' does not contain a definition for `CreateText'

I've investigated the scripting documentation resource on the Unity website and been unable to find any answers. Please help. Cheers

[entropy_nz]

This is the code.

StreamWriter fileWriter = null;
fileWriter = File.CreateText(fileName);

[entropy_nz]

The same file also causes the same issue in several other courses...