Cannot sell stock symbol BXS

I am paper trading and trying to sell a stock in my portfolio with the symbol BXS and I get the following error message “asset BXS is not tradable”.

Tried liquidating the stock and I get the error “One or more positions could not be liquidated.”

I had no problems placing three other stop orders today. Why is this happening to this stock??

BXS (BancorpSouth) merged with CADE (Cadence Bancorp). Stocks are now trading under the CADE symbol.

It’s in my portfolio as BXS. How do I get rid of it?

Tried to sell CADE hoping it would remove BXS. No luck. I ended up with negative CADE stock.