asynchronous error when calling the library?

[QunNguyen]

Can you help me error :(
my app data is not fully loaded even though i have set async await !
My code:
Future<List> getListAppInfoIntall() async {
return await DeviceApps.getInstalledApplications(
includeAppIcons: true,
includeSystemApps: true,
onlyAppsWithLaunchIntent: true);
}
List listAppInfo = await getListAppInfoIntall();

The data is not loaded at once and it loads twice. I have 100 apps in my phone!

And one more error occurs when i call the library
Access denied finding property "ro.vendor.pref_scale_resolution"

Can someone help me :( Thanks