Find the program Syncronization Service Manager on the windows menu and open it

In there you can see what status has completed-export-errors

click it and you can view more information about the errors

mine turned out to be a security permission issue on the AD user

Open AD Users and Computers

Click View>Advanced Features

right click on the user with the error and go to properties

click the security tab

click Advanced

Click Enable Inheritance then click ok past the warnings