Error msg after upgrade

Hi, I recieved the following error message in “visitors in real-time” / "visitor log"
Things ‘seems’ to be are still in function… not sure what is wrong
can someone please help?

Notice: Undefined index: visitor_log_maximum_actions_per_visit in /var/www/vhosts/in-mommy.com/httpdocs/piwik/plugins/Live/API.php on line 157

Backtrace -->

#0 Piwik_ErrorHandler(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/plugins/Live/API.php:157]
#1 Piwik_Live_API->getCleanedVisitorsFromDetails(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/plugins/Live/API.php:133]
#2 Piwik_Live_API->getLastVisitsDetails(…) called at [:]
#3 call_user_func_array(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/core/API/Proxy.php:188]
#4 Piwik_API_Proxy->call(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/core/API/Request.php:145]
#5 Piwik_API_Request->process(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/plugins/Live/Controller.php:125]
#6 Piwik_Live_Controller->getLastVisitsStart(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/plugins/Live/Controller.php:30]
#7 Piwik_Live_Controller->widget(…) called at [:]
#8 call_user_func_array(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/core/FrontController.php:125]
#9 Piwik_FrontController->dispatch(…) called at [/var/www/vhosts/in-mommy.com/httpdocs/piwik/index.php:47]

Please upload the new config/global.ini.php from Piwik 1.12 -> looks like this file is not uploaded on your server

no more error msg.
but haven’t gotten any data recorded…
is the new javascrpit tracker changed?
or is it becuase of my database isn’t altered correctlly?