This came while trying to open my daughter's gmail account through my computer. And instagram too.


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Well, there are details missing to give. Complete answer but I'll give it a try. The message is saying that the link or file you have used is not actually a web address. A standard web address looks similar to any of the following:

www.gmail.com
Https://gmail.com
www.instagram.com
Https://instagram.com

What you seem to have clicked on is "com.apple.systempreferences…". This is usually the name of a support file found on all Macs but users usually do not find their way to this file. It's hidden by default. I do not know how you could have clicked on it or asked safari to try to open it.

There is another explanation. I have seen a message similar to this when the user on the computer is restricted. The Mac has the ability to allow an admin user to place parental controls on a different user. Think parent user controlling a child user on the same Mac. If the child (parental controlled user on the Mac) tries to go to a restricted website, you may see this message.

So try going directly to either gmail.com or instagram.com by typing in the website manually then entering your daughter's username (email address) and password. If those sites still fail to load on your computer, then it's certain that you have parental controls turned on on that user.