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Issue 'mautic.NOTICE: RuntimeException: Failed to start the session because headers'

[2020-05-10 00:30:04] mautic.NOTICE: RuntimeException: Failed to start the session because headers
have already been sent by “/var/www/html/plugins/HelloWorldBundle/HelloWorldBundle.php” at line 31.
(uncaught exception) at /var/www/html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php
line 151 while running console command mautic:dashboard:warm