We're unable to log you in

i updated my LoL to 7.18 yesterday but i received "We're unable to log you in because you may be offline" error. before update i had never experienced that kind of problem. i did repair twice but it did not make any changes. i reseted my adsl to change ip but it didnt worked. how can i solve it? https://imgur.com/Md8L2jc edit: this "https://boards.euw.leagueoflegends.com/en/c/help-support-en/0ozOAbUG-known-issue-were-unable-to-log-you-in-because-you-may-be-offline " didnt help !!
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