Zend Guard Loader + php56 + FastCGI имеет ZendLoader_errors

Я использую конфигурацию:

Windows server 2016 x64
PHP 5.6.15 x86
Apache / 2.4.23 x64
FastCGI x64
Zend Guard Loader v3.3

php.ini

[ZendGaurdLoader]
zend_extension="D:\php\ext\ZendLoader.dll"zend_loader.enable=1
zend_loader.obfuscation_level_support=3
zend_loader.disable_licensing=0
zend_loader.license_path=

[opcache]
opcache.enable=0
opcache.enable_cli=0
opcache.memory_consumption=64
opcache.interned_strings_buffer=4
opcache.max_accelerated_files=2000
opcache.max_wasted_percentage=5
opcache.use_cwd=1

Кажется, что все работает нормально, но в Windows Event Viewer я получил ошибку:

The description for Event ID 487 from source Zend Loader cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event:
Unable to view file mapping
Attempt to access invalid address.

и на C: / я вижу, ZendLoader_errors.txt был создан, содержание ниже

[3068] Unable to view file mapping:[487]A
[19620] Unable to view file mapping:[487]A
[18144] Unable to view file mapping:[487]A
[4272] Unable to view file mapping:[487]A
[17164] Unable to view file mapping:[487]A
[7864] Unable to view file mapping:[487]A
[11032] Unable to view file mapping:[487]A
[4912] Unable to view file mapping:[487]A

Кто-нибудь знает, что является причиной этой ошибки?
заранее спасибо