I have seven Green Single Mini Tree LIght, but only six White Single Mini Tree Light. The tree decoration app won't let me put a seventh one on, which I want to make a pleiades with my new Tree Background.

Any guesses on how to fix this?

buy another White Single Mini Tree Light and add it to your ornament inventory. Or maybe you've added too many ornaments overall (I can't off-hand remember the limit) - try removing one of the other ornaments and then see if it will let you add another white one?

aha, thank you! I was taking the warning to literally. It probably means both of those things, it thinks I don't have enough lights of that kind already in my Ornaments because I need to update my cache once more again AND I have reached my fifty-item limit