Class undefined: MongoCursorException

[ProdigyView]

I'm on HHVM 3.82 and I getting this error in the HHVM logs:

[hphp] [23122:7f9591bff700:2055:000001] [] \nFatal error: Class undefined: MongoCursorException

I'm digging more into the problem but is there any clue to what this is yet?

[ProdigyView]

So it works in php-fpm. Does anyone have an idea what can be causing this?

[ProdigyView]

A little more info, I defined the class and did a stack trace after I created my own undefined class:

http://pastebin.com/AgYG3LAZ

[ProdigyView]

One more update, it occurs when I use $push.

[devdreamajax]

Hi, I have installed mongo-hhvm driver with php version of 5.6. I have connected the mongo database while executing hhvm filename.php. I got an error as
"Uncaught exception: Could not open extension /usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212/mongo.so: /usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212/mongo.so: cannot open shared object file: No such file or directory" .
In php.ini file , i have specified extensions as,
hhvm.dynamic_extension_path=/usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212,
hhvm.dynamic_extensions[mongodb]=mongodb.so .
kindly provide me solution to proceed further.