#2692 Invalid login when adding of editing event

[Simonic]

I'm using WebCalendar 1.1.6 with LDAP authentication. Everything is working fine so far, but when adding (or modifying) an entry, the operation succeeds but an "Invalid login" message is shown for only some users not for all.

In the file includes/user-ldap.php, search for $error = 'Invalid login';.
I find it 4 times. I Change it instance by adding a number after
it.

$error = 'Invalid login1';
$error = 'Invalid login2';
$error = 'Invalid login3';
$error = 'Invalid login4';

and my error is Invalid login4