WHY my phone is not shown on pc when connecting with data cable ?

i trying to connect my nexus 6p with my laptop using data cable but it did not show my phone in the my pc folder and it shows that code 19 error is there . how i can reset it

Have you installed the Google USB Driver in your laptop? If not, do so.

Welcome to Android Central! Where do you see this Code 19 error -- on the phone or the computer? Have you already tried different USB cables? When you connect via USB, are you also swiping down the notification panel on the phone and making sure it's connected via MTP, and not just Charging Only?