tk2d sprite collection question

Unity version: 2019.4.31f1 personal

Question: When I use the plug-in TK2d, the tk2dSpriteCollection I created cannot be used in the Inspector [open Editor]

There will be the following tips in the game: as shown in the figure

I hope that a powerful boss can help me answer this doubt. I did not find this tip and any clues related to this tip through google, various search engines

anyone can helo me?t -t