Peep error: "Multiple accounts are not supported"

I have an HTC Wildfire S that I bought just over a year ago. A few days ago the HTC Peep application stopped working. Every time I try to use it, I get the message "Multiple accounts are not supported." I don't know why I'm getting this error or what it means. I cleared all the data from the app, and I made sure that I wasn't logged in to the mobile Twitter website, just in case that had something to do with it, but neither of these actions made any difference. I then tried to install a new Twitter app, but due to the lack of storage space on the Wildfire, I couldn't do that, either. Can anyone help?