Schools in Trafford

RAZOR VIEW ERROR
The control '' has raised the following error:
F:\Websites\beta.trafford.gov.uk\SiteElements\Razor\Schools.cshtml(141): error CS1061: 'School' does not contain a definition for 'SchoolCoordinates' and no accessible extension method 'SchoolCoordinates' accepting a first argument of type 'School' could be found (are you missing a using directive or an assembly reference?)