While playing a game on facebook . And Error 303 poped up

Hello. While trying to play a game on facebook Error 303 poped up , so I wrote to the game app I was playing and showed them the error 303. And they replyed here - Error 303​​- is a conflict between your browser and antivirus scanning web traffic. The game could not connect to game server. The reason is the anti-virus installed on your computer and scan your web traffic (such asAvast Antivirus). So I was wanting to ask you , What should I do ?

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