Blank page on the ocsreports page

I have blank page when I'm trying to access to website: http://msuntec6/ocsreports/

it is a new installation

My environement:

Linux msuntec6 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

OCS Inventory V2.2

I don't have any error in the ocs_server_setup.log fichier

what can I cjeck?

Any idea??

Thanks

Didier