ListView.Builder(

// scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: isSearching == true
? contactFilter.length
: contacts.length,
itemBuilder: (context, index) {
Contact contact = isSearching == true
? contactFilter[index]
: contacts[index];
return GestureDetector(
child: Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.r),
),
elevation: 2.0,
child: Center(
child: Container(
margin: EdgeInsets.all(10),
height: 80.h,
child: ListTile(
onTap: () {
phone.getPhoneNumber(contact.phones!
.elementAt(0)
.value!);
enmPaymentType type = enmPaymentType.tmCell;
fillFields();
Get.to(
() => ServicesPayView(type, payment));
},
title: Text(contact.displayName!),
subtitle:
Text('${contact.phones!.elementAt(0).value}'),
leading: (contact.avatar != null &&
contact.avatar!.isNotEmpty)
? CircleAvatar(
backgroundImage:
MemoryImage(contact.avatar!),
)
: CircleAvatar(
child: Text(contact.initials()),
),
),
),
),
),
);
},
),

Используйте gist пожалйуста

У тебя список пустой пишет на русском языке И скорее всего возникает elementAt(0)