Follow the article in the link to fix if this problem arises:
Month: August 2015
Manage recycle bins in Sharepoint
Use Process Explorer to find out which program is using a file
Use process explorer: https://technet.microsoft.com/en-us/sysinternals/bb896653
To find out which program is using a file.
Deploying Sharepoint timerjob
Whenever a new Sharepoint timerjob project is deployed, it will activate the feature on all Sharepoint web applications. Remember to go to Central Administrator and deactivate the feature on the web apps that don’t need it.
Uninstall Sharepoint feature using the powershell
Install dll to Sharepoint 2013 GAC
https://camerondwyer.wordpress.com/2013/05/22/how-to-install-a-dll-to-the-gac-on-windows-2012-using-only-powershell-without-having-to-install-sdk-or-visual-studio/
Document library option missing on “Add an app” in Sharepoint 2013
The document library option is part of the Team Collaboration Lists feature, if it’s not showing, try activating the feature again.
To debug a Sharepoint timer job
Deploy the timerjob.
Open Services and restart the Sharepoint Timer Service.
In Visual Studio, attach to OWSTimer.exe
Set break point and debug as usual
Change email to HTML
In Outlook, to change the formatting of email, in the ribbon go to “Format Text”, under “Format” click either “HTML”, “Plain Text” or “Rich Text”