my matlab doesn opening. i tried to renew my license but now i keep getting the same error -9,57. i have watched the videos about how to renew licanse and i did the same things but why do i keep getting the same error and what does this mean? what do i do wrong? i only see one licanse number which is activated at 12.10.20. don't i need to see a new licanse number with up to date activation date?