[SOLVED] error Permission to perform the operation is denied for name on ver. 19.07

Update:
Upgrading to PHP 7.0.33 we solved the problem

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Hi,
I've installed VTENEXTCE V. 19.07 without errors during the installation process; I can also log in.

But if I select any of the following options:

• Leads
• Accounts
• Contacts
• Campign
• Reports

I receive this error:

Fatal error: Uncaught exception 'WebServiceException' with message 'Permission to perform the operation is denied for name' in /var/www/html/vtenext19ce/include/Webservices/VtigerWebserviceObject.php:57 Stack trace: #0 /var/www/html/vtenext19ce/include/Webservices/Utils.php(449): VtigerWebserviceObject::fromName(Object(PearDatabase), 'Leads') #1 /var/www/html/vtenext19ce/modules/CustomView/CustomView.php(74): vtws_getModuleHandlerFromName('Leads', Object(Users)) #2 /var/www/html/vtenext19ce/modules/CustomView/CustomView.php(61): CustomView->getMeta('Leads', Object(Users)) #3 [internal function]: CustomView->__construct('Leads') #4 /var/www/html/vtenext19ce/include/BaseClasses.php(44): ReflectionClass->newInstanceArgs(Array) #5 /var/www/html/vtenext19ce/include/BaseClasses.php(150): VTEClass::constructClass('CustomView', Array) #6 [internal function]: SDKExtendableClass::getInstanceByName('CustomView', 'Leads') #7 /var/www/html/vtenext19ce/data/CRMEntity.php(115): call_user_func_array(Array, Array) #8 /var/www/html/vtenext in /var/www/html/vtenext19ce/include/Webservices/VtigerWebserviceObject.php on line 57



I've searched on the manual about system requirements, but I wasn't able to find it.
My actual configuration:
RAM = 4 GB
Disk = 100 GB
cpu = 2x1Core
OS = CentOS 6.10

php 5.3.3
mysql 5.6.46
apache 2.2.15

Thanks