First, make sure you have logged into your imo
account and have added contacts.
Second, check if your network connection is
normal, as sometimes network issues can
prevent the contact list from loading.
Additionally, the imo app may need an update,
so ensure that your app is the latest version.
Finally, if none of the above methods solve the
problem, it may be an issue with the imo server,
so it is recommended to wait for some time then
try again.