If you are getting notifications from ExpressionCargo, then your Mac is infected with adware. ExpressionCargo is adware for Mac.
ExpressionCargo changes setting in your Mac. First, ExpressionCargo installs a browser extension in your browser. Then, after ExpressionCargo hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.