SharePoint Troubleshooting: Object reference not set to an instance of an object in SharePoint
Error message
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Object Reference not set to an instance of an object.
https://1.bp.blogspot.com/-TSi76wh0AYw/Vsrd-E9v4bI/AAAAAAAAAJA/9ZYeXi_gdqE/s400/73.png
IISreset
1- First of all, open PowerShell as an administrator
2- In PowerShell, write the following script "iisreset"
If this will not resolve your problem check the following things.
IISManager
1- Check in IISManager that SharePoint Webservices default is running.
or
2- Check the Application Pool that "SharePointTokenServiceApplication" is running.
or
3- Go to Central Admin -> Manage Service Application -> Delete the User Profile Service.