Using my own Base Template

When I try to select my own master page as a base template for one of the templates, I get a pop up error with the following message:

Value cannot be null.
Parameter name: g

Any insight into this? Thanks.

Hi Lorne,

Thank you for contacting us.
This issue should be fixed in the SP scheduled for the middle of March.
Actually, the problem appears when you try to set master page for already existing template (Actions menu > Base Template > Use you own .master file).

So, currently the workaround is to set the required master page when creating the template:
1. Click Create a template button
2. Fill the Name and choose Use template option
3. Click Select another Template button
4. Click Use you own .master file
5. Select the master page

Best wishes,
Sonya
the Telerik team