(Time clock configuration)
As shown in the message above this error will happen if you don't have your clock in your PC configured in automatic mode.
Go to the time and date tab and click on adjust date and time as shown below. (You have to make a right click with your mouse on the time and date in order for this tab to be displayed.)
Make sure that the time is configured in automatic (If still you have the error try turning it off and on back again to schedule the time properly)
After this you should be able to make any transaction and also claim the active user reward without any issues.