What does your page directive look like at the top of your Scheduling.aspx codeinfront? Did you set a MasterPage for it? and does it have a <head> tag with runat="server"?
As Mathias says, it has nothing to do with pagetypebuilder, the error happens when EPiServer applies the rightclick functionality and it demands that the head-tag has runat-server on it, so in your page or masterpage, that contains the head and html, it should look like tis:
I have created a pagetype using pagetype builder 1.3. In that pagetype builder i have defined a property.The code is like this
RightClickMenu requires a header control on the page. (e.g. <head runat="server" />).
Why this error is coming