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Hi my site www.kathmanduclothing.com is having problem with login or new registration.

When I enable debug it gives following errors:
 

(1/1) ContextErrorException

Warning: session_start(): Cannot start session when headers already sent

in FrontController.php line 700

at FrontControllerCore->prepareNotifications()in FrontController.php line 664

at FrontControllerCore->display()in Controller.php line 312

at ControllerCore->run()in Dispatcher.php line 515

at DispatcherCore->dispatch()in index.php line 30

If enable the debug then the front end of site does not work also. So I have disable it. Then front end of site (eg not the login) works. 

This site is running on  Prestashop 1.7.6.7

 Current theme in use: alysum

PHP version: 7.2.33

Memory limit: 512M

Max execution time: 120

Upload Max File size: 512M

Any assistance will be much appreciated.