Some commands display an error whith spaces

I haven't tested all of them, but a few I found occurred when adding a team, creating a scoreboard, giving an amount of items, or giving effects.

However, when you start typing, it displays the guide.

This bug isn't too major because the command still works, but is annoying. I'm still figuring commands out and find the guide pretty helpful sometimes. I can start typing and see what's supposed to go where, but if it's just a space, I get the error. It seems like it doesn't like things that the player decides (like a name or amount) because any part that can be auto-filled works fine.