Anyone been getting "Plugin file does not exist" message?

Has anyone been getting this lately:

The plugin post-plugin-library/post-plugin-library.php has been deactivated due to an error: Plugin file does not exist.

This seems to happen every time I install a new plugin of some kind or refresh the page no matter what I’m doing, but the plugins work fine afterward. This seems to be a glitch or some plugins are fighting with each other. I don’t know how much cause for alarm this is–I’ve had no horrible crashes or anything of the like happen to me so far, but I do daily backups just in case something happens.