Hi and welcome to the forum
Apologies for the late reply
Scripts can only write to the htdocs directories they are in. Any directories outside the htdocs dir cannot be written - due to the open_basedir restriction.
The reason why this is happening to you is:
Moodle requires a directory to store data that should not be web-accessible. However, for security reasons, software on free hosting is blocked from accessing anything outside its own website folder. So Moodle cannot work with the way security is enforced on free hosting.
/home/vol10_1/epizy.com/epiz_33865509
as you see… in your path - there is no htdocs folder
The solution is creating the directory manually (inside of htdocs) and then updating config.php
$CFG->dataroot = '[pathwaytothemoodledatafolder]/moodledata';
something like that 
I haven’t tested and I don’t know if there will be another problem
a topic that might be useful