FormatException: Unexpected character (at character 1) in Flutterinsta Package - flutter

Question

I am using FlutterInsta package. I am getting some information after entering username in textfield. But i am getting this kind of exception after some time.
This is the error :-
I/flutter ( 8708): FormatException: Unexpected character (at character 1)
I/flutter ( 8708):
I/flutter ( 8708): ^
Here is the code :-
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Instainfo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
FlutterInsta flutterInsta = new FlutterInsta();
var text;
String url,followers,following,bio,username,website;
List<String> feed = [];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body:ListView(
shrinkWrap: true,
children: [
TextField(
onChanged: (val) {
text = val;
},
decoration: InputDecoration(
suffixIcon: IconButton(
icon: Icon(Icons.send),
onPressed: () async {
try {
await flutterInsta.getProfileData(text);
setState(() {
followers = flutterInsta.followers;
following = flutterInsta.following;
});
} catch (e) {
print(e);
}
},
),
hintText: "Enter Username",
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(20.0),
),
),
),
),
Column(
children: [
Text("Followers :- $followers"),
Text("Following :- $following")
],
),
),
],
),
),
);
}
}
Is there any limit to request this package ?