Hi Ruben,
Sorry for late reply to this,
I have tried to access in your backend, but i hitting this :
0 Cannot open file for writing log
Can you consult with your webhosting provider regarding this?
Because most likely your path to the logs folder may be incorrect.
To check/change the path, in Joomla backend, go to Global Configuration and then choose the Server tab and check if the Path to Log folder is correct.
Or go to your configuration.php file and check for it.
Keep us updated then when you resolved this.