Updating landing page content: system error
Hello,
I'm trying to update landing page content using the same body as the one provided on the website here:
http://developers.marketo.com/rest-api/assets/landing-page-templates/#create_and_update
This is the query I'm sending:

I've tried both with and without the header:
Content-Type: multipart/form-data; boundary=---------------------------9051914041544843365972754266
in the header section

But I'm getting system error either way.
The landing page template with Id 5 is in draft mode and has just been created.
Any feedback will be appreciated,
Thanks.
