The above given issue means there is some problem with the compatibility between windows 10 version 1803 and Avast’s behavioral shield module, therefore in order to get this problem fixed the user needs to run an update check on the system, in order to start with the procedure open the Avast user interface then select “menu” after that go to “settings” then go to the option “update” then select all the update buttons on the screen , once the update completes then the issue will be resolved instantly and for more info: http://www.avast-phone-number.com/