I don't mean to be rude but people really need to start using the SEARCH feature on this site because this question has been asked a bunch of times the past couple of weeks.
If you have PhotoAlbums+ installed, the last update caused this issue. They (the developers) are aware of it and it will be addressed in the next "final" version release.
In the meantime, you can either:
-uninstall PA+
-disable the MS add-on for PA+
-add the source repo and install the latest BETA version of PA+ that fixes this issue
-ignore it until the app is updated