[Fixed] Fern's second pokemon won't come out

[BlackDream 0]

So, I'm at Aya's gym trying to fight Fern. I beated his Rhyhorn but instead of him sending out his second mon, an error message popped out. No matter what I tried to do during the battle, the sam error message kept popping out, and he would never send out his second mon. Plz help

 

[Commander 876]

Try this:

 

[BlackDream 0]

I appreciate the help