The "provider" for "com.tesloiloil.notifier" is an application that provides a URL content://com.teslacoilsw.notifier. This application is a paid version of Nova Launcher Nova Launcher Prime plus the TeslaUnread plugin for Nova Launcher.
So you are probably using the free version of Nova or a completely different launcher.
One way or another: Plus-Messenger should not crash when content://com.teslacoilsw.notifier/unread_countunavailable. If so, this is a bug in Plus-Messenger.
, , , Plus-Messenger "" TeslaUnread.