Failed open stream

I can’t solve this problem in cms 3.3.12
image
image

Error on page

does not generate or load any reports

Warning: file_get_contents(arquivos/certs/encryption.key): failed to open stream: No such file or directory in xxxxxxxxxxxxxxxxxxx/lib/Service/ConfigService.php on line 600
{“html”:null,“buttons”:“”,“fieldActions”:“”,“dialogTitle”:null,“callBack”:null,“autoSubmit”:null,“success”:true,“message”:“Configura\u00e7\u00f5es Atualizadas”,“clockUpdate”:null,“login”:null,“id”:0,“extra”:,“data”:}