Symbol was purchased, then became untradable

This Monday I bought (on my paper account, luckily) symbol PYX. Today I wasn’t able to place a sell order for it for this reason:

APIError: asset PYX is not tradable

What would happen if I bought this or a similar symbol for real money? How would I be able to liquidate a position for a symbol that was tradable when I bought it but is no longer tradable?

I have the same problem, and it’s causing things in pylivetrader to fail: