The activation key for Sage 50 is invalid or could not be read

SUGGESTED

We have been using Sage 50 Accounting 2014 for past 6 month. But from today morning my Sage 50 showing this Error message "The activation key for Sage 50 is invalid or could not be read, Would you like to re-activate now?" If I press YES,  this message will display "There was a problem Activating, Please try again later"

Can somebody help me about this??