"Only First Character From Library Can Be Dropped Into Scene"

Getting this warning message when trying to drop a png into BB. The same image works as an object but not a character. Any clarification would be great thanks.

 

Only one character image on a scene at a time. The character you dropped should be in your library.

 

Do not you worry, that is only a warning: BB allows only one character on the game field, since you already have one, it will not create another one. That is the message about. You will be able to choose the secondary character from the character selector menu (you have to place that on the main menu and/or game over screen)