get_user_meta Function Undefined

According to this blog this function…

http://codex.wordpress.org/Function_Reference/get_user_meta

Replaces get_usermeta however when using the new function it causes an error, when using the old function it does not return a value it only returns false. I’ve been testing it for hours trying to figure it out and I’m almost convinced theres a core issue or not enough information about obtaining values from a users meta data.

To be clear, this causes undefined function error…

get_user_meta($_POST[‘wcm_customer_submit’], ‘wcm_pointsbalance’);

and this does not…

get_usermeta($_POST[‘wcm_customer_submit’], ‘wcm_pointsbalance’);

In version 2.9.2