Can not run set operation and save

[MrMegamind]

I am running following code

	$hubr_messenger_message = ParseObject::create("hubr_messenger_message");
	$hubr_messenger_message->set("msg_id", $parse_arr->msg_id);
	$hubr_messenger_message->save();

and get following error
Fatal error: Interface 'Parse\Internal\FieldOperation' not found in /includes/sdk/parse/php-sdk/src/Parse/Internal/SetOperation.php on line 17

This is file structure of sdk/parse/php-sdk/src/Parse/Internal http://prntscr.com/l0mcaa

I assume we are missing a file here?

Documentation here states there should be a file FieldOperation.php in internal
http://parseplatform.org/parse-php-sdk/namespaces/Parse.Internal.html

[MrMegamind]

I downloaded raw file from GitHub and uploaded in SDK folder but still no luck, same error:

Fatal error: Interface 'Parse\Internal\FieldOperation' not found in /includes/sdk/parse/php-sdk/src/Parse/Internal/SetOperation.php on line 17

[acinader]

Have you gone through the installation and getting started sections of the guide?

https://docs.parseplatform.org/php/guide/#installation