Cannot resolve symbol 'GetFile'

I have just created an event receiver to ensure that my colour palette is activated on my 2013 Web application. The below code is what I have inside

public class SitePublishingResourcesEventReceiver : SPFeatureReceiver 

I keep getting the error Cannot resolve symbol 'GetFile'

public override void FeatureActivated(SPFeatureReceiverProperties properties)
    {

        // Get the SPColor file. Replace with the path to your SPColor file.
        SPFile colorPaletteFile = Web.GetFile("_catalogs/theme/15/ColorPalette.spcolor");
        if (null == colorPaletteFile || !colorPaletteFile.Exists)
        {
            // TODO: handle the error.
            return;
        }

I have googled to see if I'm missing usings or something, but I can't find anything

Thanks in advance for your help