Multiple blank page errors

Hello,

I just installed 0.7.0 Beta 2 version, and I have multiple blank page problems.

When I try to edit a list assets item, I get a blank page (same when I try to add a new one and click "save and continue edit").
Log error seems to be :
mod_fcgid: stderr: PHP Fatal error: Call to a member function getItem() on a non-object in /var/www/vhosts/domain.fr/httpdocs/administrator/components/com_solidres/models/reservationasset.php on line 270, referer: www.domain.fr/administrator/index.php?op...ionasset&layout=edit

When I try to add a menu item to access the component in frontend, I also get a blank page when clicking on menu item in frontend.
Log error seems to be :
mod_fcgid: stderr: PHP Fatal error: Call to a member function load() on a non-object in /var/www/vhosts/domain.fr/httpdocs/administrator/components/com_solidres/models/reservationasset.php on line 257

Could you please give me some help to fix this ?
Best regards,
David

Hello,

First I tried to update from 0.6 to 0.7, and I had other bugs, so I tried to uninstall it all (I had to delete all tables in database manually because I had an error message), to make a fresh install.

Other bugs disappeared but I still have these two I can't fix.

Please keep me in touch when you have improvments.
Best regards,
David