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Error 'Can't create directory' when editing a theme

Error 'Can't create directory' when editing a theme



First of all I hope I posted in the correct section. 

I installed Magento CE v2.1.5 on a subdomain of mine. 


When I go to Admin Panel -> Content -> Configuration and I choose to edit the theme for a store (I have only one) I get the error "There has been an error processing your request. Exception printing is disabled by default for security reasons. Error log record number: 1428033442577".


Opening the respective file on var/ report, it says this: "a:4:{i:0;s:117:"Can't create directory /home/raldesig/";i:1;s:12228:"#0 /home/raldesig/ Magento\Framework\Code\Generator->generateClass('Magento\\Theme\\M...')"


The 'var' folder has permission 0755 and I even checked the option Recurse into subdirectories -> Apply to all files and directories from FileZilla but with no result. 


Having a shared hosting I have no access to log in to the server in order to write some permission codes. 


How can I solve this problem? At this point I have no theme on the website (altough it's only for testing purposes).