Hi, This issue is now resolved in version 2.3 you can download it and try again.
OR
To allow access to import please add this to the page access manager page action."import_data"
Example
public static $usersRolePermissions=array(
'administrator' =>
array(
'customers' => array('list','view','add','edit','delete','import_data'),
'expense' => array('list','view','add','edit','delete','import_data'),
'products' => array('list','view','add','edit','delete','import_data'),
'sales' => array('list','view','add','edit','delete','import_data'),
'users' => array('list','view','add','edit','delete','import_data')
),
);
I believed while it did not work first time probably you are overwriting the PageAccess Manager file when publishing project.
Just download the new version. It fixes other issues.
Thanks for the update and support.
Best Regards