Errors after migrating from CoreBOS 5.8 to CoreBOS 7

[anigoni]

Hello everybody,
today I performed migration from CoreBOS 5.8 to CoreBOS 7.
I have followed instruction I found on CoreBOS documentation, but, logging on system as admin, I have a blank page.

Following, error displayed on php_error_log file:

[25-Jan-2017 22:27:37 UTC] PHP Fatal error:  Directive 'allow_call_time_pass_reference' is no longer available in PHP in Unknown on line 0

[25-Jan-2017 22:27:40 UTC] PHP Fatal error:  Directive 'allow_call_time_pass_reference' is no longer available in PHP in Unknown on line 0

[25-Jan-2017 22:27:54 UTC] PHP Fatal error:  Uncaught exception 'WebServiceException' with message 'Permission to perform the operation is denied' in C:\xampp\htdocs\corebos7\corebos\include\Webservices\Retrieve.php:25
Stack trace:
#0 C:\xampp\htdocs\corebos7\corebos\modules\com_vtiger_workflow\VTEntityCache.inc(23): vtws_retrieve('27x3159', Object(Users))
#1 C:\xampp\htdocs\corebos7\corebos\modules\com_vtiger_workflow\VTEntityCache.inc(107): VTWorkflowEntity->__construct(Object(Users), '27x3159', false)
#2 C:\xampp\htdocs\corebos7\corebos\modules\com_vtiger_workflow\VTEventHandler.inc(45): VTEntityCache->forId('27x3159')
#3 C:\xampp\htdocs\corebos7\corebos\include\events\VTEventTrigger.inc(143): VTWorkflowEventHandler->handleEvent('vtiger.entity.a...', Object(VTEntityData))
#4 C:\xampp\htdocs\corebos7\corebos\include\events\VTEventsManager.inc(118): VTEventTrigger->trigger(Object(VTEntityData))
#5 C:\xampp\htdocs\corebos7\corebos\data\CRMEntity.php(908): VTEventsManager->triggerEvent('vtiger.entity.a...', Object(VTEntityData))
#6 C:\xampp\htdocs\corebo in C:\xampp\htdocs\corebos7\corebos\include\Webservices\Retrieve.php on line 25

Thanks in advance to everybody that will help me!

Regards,

Andrea Anigoni