Hi,
Thank you for your feedback.
Would you please tell us more details of your question?
It would be helpful if you could send us a screenshot of the error page.
Feel free to let us know if you need further help.
Best Regards,
Well, I have the exact same problem running the latest AirDroid client available today on the Galaxy Note 8 in the Google Play Store and on Windows and macOS High Sierra. If you look at the three screenshots you'll notice that I have double, some triple times the same contacts in the list, this on the web.airdroid.com connection (locally on the same network) as well as the local connection directly to the IP of the device. Both also have missing contacts if you look at the screenshot from the latest AirDroid client on the Mac. There you will also see doubles and you'll see contacts that you don't see and thus are missing on the web client. This is very annoying if you need to look up some contacts. I have this on the Mac client as well as on the Windows client. And there are no double contacts in the Contact app on the device. So the issue is really in AirDroid.
On the other hand, the AirMirror works absolutely fine via the web.airdroid.com in Google Chrome with the Chrome AirMirror plugin. The device is not rooted so I connect it once with the USB cable to my PC and afterwards it works perfectly. Even in HD and fullscreen I'm able to play games!!
For those getting error or device not found in Chrome, maybe you are missing the AirMirror Chrome plugin. This one needs to be installed in order for this feature to work. Just a tip :-)
My device is a Samsung Galaxy Note 8 with Android Nougat 7.1.1.