The following error is logged in ULS when you try to create a new page based on a customized template.
Exception message: No parameterless constructor defined for this object.
This issue is most likely caused by problems with the page layout that you are trying to create the new page from.
Open the page layout in SharePoint designer and examine the code for any errors. Errors in the code will be highlighted in yellow. Resolve the code errors and the problem should go away.