function ‘TransferOutBeforeUpgrade’ not found or invalid function name

PHP message: PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, function 'TransferOutBeforeUpgrade' not found or invalid function name in wp-includes/class-wp-hook.php on line 288
PHP message: PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, function 'TransferInAfterUpgrade' not found or invalid function name in wp-includes/class-wp-hook.php on line 290

This is an error I am getting on version 4.4.17.
Here is a fix (file: Functions/Version_Upgrade.php):

add_filter('upgrader_pre_install', 'UPCP_SetUpdateOption', 10, 2);
add_filter('upgrader_pre_install', 'UPCP_TransferOutBeforeUpgrade', 10, 2); 
add_filter('upgrader_post_install', 'UPCP_TransferInAfterUpgrade', 10, 2);