Did you download your config file and your members profile photos,if not this is reason you might be getting this error message doing a fresh install and only adding your back up DB backup

i change the false to true, right on config.php at ow_includes, then now i change it back to false

file permissions should be 644

folders permissions should be 755, except for ow_log, ow_static, ow_userfiles, ow_pluginfiles, they should be 777

I don't see mod_rewrite among your server settings

what i did actually is to download the backup, remove the existing content, then upload the backup, then multiple problems happen

then copy original htaccess file

request your hosting enable mod_rewrite

You currently do have a .htaccess file in your domain folder, however we cannot know if this is the default for the script your are running or not. You could probably search for the default one in Google or ask of the oxwall support to provide you with one.
To enable to rewrite engine you need to have the following two lines of code in the file:

RewriteEngine On
RewriteBase /

In our opinion leaving the permissions for every file and folder to 755(read/write) would be OK and would not cause any problem.