Paint Tool. Please help!

I made a sticker. And a nice sticker that I wanted to use. I was going to use it last night but forgot to place it down. When i opened my popit today and clicked on the sticker. It wouldn't stop loading for 5 mins, it just wouldn't stop. So I triple tapped circle to exit popit, re-opened it and saw the dreaded RED EXCLAMATION MARK by the sticker :(

This has not happened to my test sticker (made before the one mentioned above) but i'm worried it might :(

Can someone help? Thanks in advance :)

You are not the only one: This thread