Overview
You have installed Sitrion Social Sites v.5.2.404 / 5.2.397.9 on a SharePoint 2013 farm. After the installation, you notice that Central Admin displays a similar health alert or several alerts of the same kind:
"[MissingFeature] Database ]has reference(s) to a missing feature: Name = [NewsGator Social Menus (Hidden)], Id = [deb205d2-f925-47e5-b3e7-305c9a5cd015], Description = [A hidden feature which adds social menus to the web.], Install Location = [NewsGator.Core.Fifteen_SocialMenus]. Feature (Name = [NewsGator Social Menus (Hidden)], Id = [deb205d2-f925-47e5-b3e7-305c9a5cd015], Description = [A hidden feature which adds social menus to the web.], Install Location = [NewsGator.Core.Fifteen_SocialMenus]) is referenced in database [], but isn't installed on the current farm. The missing feature might cause upgrade to fail. If necessary, please install any solution that contains the feature and restart upgrade."
Solution
The error above identifies the missing feature as "NewsGator Social Menus (Hidden)," located within NewsGator.Core.Fifteen_SocialMenus. This feature is part of the NewsGator.Core.Fifteen.wsp solution file, which you can re-deploy using the following command:
Install-SPSolution NewsGator.Core.Fifteen.wsp -CompatibilityLevel {14,15} -GACDeployment -AllWebApplications -Force
Note: The command above assumes that you run Social on all web applications. If not, remove the "-AllWebApplications" parameter.