Problem with memory

Hi, i have the strange issue with memory.
There is verbose output from check_esxi_hardware.py:
http://pastebin.com/vm5fbXS3

And i dont have any idea about this CRITICAL error. I checked memory on this server by memtest and there is no errors. By the way, there is no any alerts in vSphere Client on this hypervisor. So, why i have this CRITICAL output?