Notification panel empty/blank after upgrade to 3.15

Hello,

I upgraded from 3.14 to 3.15,
DB: MySQL
OS : Ubuntu
Traccar official web and official version of app.

Issue : the notifications panel shows up empty.

Error's seen : None
Error in wrapper log : Error: Can't DROP 'uk_user_token'; check that column/key exists [Failed SQL: ALTER TABLE gps.users DROP KEY uk_user_token] (This error in wrapper log, there has been previous posts that said, its safe to ignore so I am ignoring) other than that i do not see any errors. or reason as to why this happened after upgrade.

screenshot : https://www.dropbox.com/s/2vfk3wv21gv5inb/Screenshot%202018-01-24%2011.06.37.png?dl=0

and when trying to send a command, under command dialog box, while selecting type drop box it returns the following http error.

screenshot : https://www.dropbox.com/s/tswvgwal94gtbbr/Screenshot%202018-01-24%2011.07.43.png?dl=0

please do advice, on how to troubleshoot this situation.

You have to upgrade everything properly. Looks like you haven't updated web app.

Hello Anton,

I upgraded using the installer. after uninstalling and removing old installation. it's a fresh installation.

web app in the installer by default installs same i am using.

Please provide a link to your server.

I have emailed you the details.

Also now I do see that the web-interface seems to be working all well...