Guild Wars 2

My hero panel says that I need Mastery points to continue. My experience bar says that I have 3,175,000 experience points out of 3,175,000. I have zero unspent mastery points.
The last bit unlocked was Supply Line Management. Do I have to craft all the pact recipe items to continue?

I have had 3,175,000/3,175,00 experience for months now. How do I convert these experience points into a mastery point? Experience scrolls won’t activate. Experience boosters seem to be useless. The wiki is useless on this subject.
Searching the forum found zero posts about mastery. Only 2 posts containing the letter m. And zero posts containing the letter e. I think the search function gives up too easily.