So... i had this gallery on another joomla website and now i migrated this website on another server, fact is, Simple Image gallery is not working, and before it used to. I reinstalled it but the same errors are displaying:

Warning: mkdir() [function.mkdir]: Permission denied in /home/mifa1624/public_html/plugins/content/jw_simpleImageGallery/jw_simpleImageGallery/includes/helper.php on line 32

Warning: imagejpeg() [function.imagejpeg]: Unable to open '/home/mifa1624/public_html/cache/jw_simpleImageGallery/jwsig_cache_e3ec63e8b9_1.jpg' for writing: No such file or directory in /home/mifa1624/public_html/plugins/content/jw_simpleImageGallery/jw_simpleImageGallery/includes/helper.php on line 134

All the files and folders in my website are respectively 644 and 755, and i don't really know what to do, I tried fixing the permissions with Akeeba Admintools, reinstalled SIG, but nothing to do.

Any suggestions? I am not very expert in servers.

Thank you