can not open module tab

[qubo2017]

Hi All

 

Suddenly I could not open the "module" in dashboard, it turns up with this error:

 

Fatal error: in /home/kakax311/public_html/classes/ConfigurationKPI.php on line 40
[PrestaShop] Fatal error in module file :/home/kakax311/public_html/classes/ConfigurationKPI.php:
Uncaught Error: Access to undeclared static property: ConfigurationKPI::$X in /home/kakax311/public_html/classes/ConfigurationKPI.php:40 Stack trace: #0 /home/kakax311/public_html/classes/ConfigurationKPI.php(119): ConfigurationKPICore::$VK() #1 /home/kakax311/public_html/controllers/admin/AdminModulesController.php(1587): ConfigurationKPICore::updateValue('UPDATE_MODULES', 33) #2 /home/kakax311/public_html/classes/controller/Controller.php(189): AdminModulesControllerCore->initContent() #3 /home/kakax311/public_html/classes/Dispatcher.php(367): ControllerCore->run() #4 /home/kakax311/public_html/admin123/index.php(58): DispatcherCore->dispatch() #5 {main} thrown

 

 

Please anyone have a solution about this? I have been having this issue on this for over a month, I really need to fix it.

 

Many Thanks!