Pinterest App not working on my Nook for several days now!

Pinterest App not working on my Nook. It won't load. I have to use the browser. Tried to troubleshoot but nodda! Tried to uninstall and it won't let me. Went to Google Play and try Install and it says that the App is not compatible with my device. I know it was installed because I have been using it for years now on the same device.