Yes, just continue. This is an error that I have ran into plenty of times. It is caused by the method we currently use to replace all of the original characters since they lack all of the needed BrawlEX files. This leads the program to be unable to read the folder properly. You can still add new clones you just will not see all of the old clones appear.
Okay, thank you. I did proceed to do so, but I noticed that there was a portrait I didn't even add on my clone, I hovered over the clone and it froze the game.. Weird.