Safari cannot open the page because the address is invalid.
App store icon is missing and Safari cannot open the page because the address is invalid.
App store icon is missing...
The App Store app is located in your Mac's Applications folder.
... and Safari cannot open the page because the address is invalid.
Please read If Safari doesn't open a page or work as expected on your Mac. For example, perhaps the address you are typing in the Safari "Smart Search" field is not a valid URL.
Additional information is likely to help elicit more helpful information. Please read Writing an effective Apple Support Communities question - Apple Community.