Means your password for the router is to easy to guess. Try changing the password using numbers with both upper and lower case. Also symboles if allowed. Try atleast 1 upper case with a few lower case with one symbole. Example: 18@Shakeel1
This warning means that your Wi-Fi connection is either using a very simple or easy-to-guess password -- or the default one -- meaning you may be at risk. Wi-Fi Inspector also checks to see if your router's admin panel is using the default password; if so, make sure you change that as well.