Hi mate, I had the same problem and I just solved it, so basically happens when you you use a cracked version of the various final cut…or if your time and date are changed in your computer…and so basically if you are using a trial version which u have to keep the date in the past to continue use it, all you have to do is to keep the date and time (fake) otherwise it won’t let you use it if you take the date and time back to normality