I try to start my live streaming in a page that I admin, but appears: (#200) Subject does not have permission to create live video on this page

I was going to start my live broadcast on a Facebook Page that I manage and appeared: (#200) Subject does not have permission to create live video on this page.

How can I solve this problem?

You will most likely need to add the Webcaster X2 to the page/group as an app. Those instructions are available from Facebook’s online help: https://www.facebook.com/help/261149227954100

Those instructions is for Facebooks Groups, not Pages. I get the problem on a page that I’m the admin.

You’re correct, the same solution does not seem to work for pages, my apologies on that. The only thing I can think of is to re-pair the Webcaster to your account, hopefully this would reset your authorizations. Please be sure to follow this guide when doing so: https://www.epiphan.com/userguides/webcaster-x2/Content/1_Facebook/tip-pair-with-facebook.htm