PHP Error

Thank you for your feedback.
Please try to change like the following code for now.
/attendance-manager/class/class-attmgr.php on line 239

Before:

public function current_user() {
	// Current operator
	get_currentuserinfo();
	...

After:

public function current_user() {
	global $current_user;
	// Current operator
	if( function_exists( 'wp_get_current_user' ) ){
		$current_user = wp_get_current_user();
	}
	else{
		get_currentuserinfo();
	}
	...

And I would like to correct it in the next version.

Thank you, I have corrected it in the code. When will you update the next version?

I will update it sometime this week or next week.

Actually, the call to the function wp_get_current_user needs to be done after the plugin is loaded (on the init action or later).

So I have removed the constructor call to the load() function (line 61) as it is being called by the plugins_loaded action (line 68). It now works well.

Thank you for advice.