Why am I getting this error in futurebuilder

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I have no idea why I’m getting an error

>Solution :

It will return null if the condition is not fulfilled.
You need to return something outside of your conditional statement or in a else condition

FutureBuilder<List<Mesajlar>>(   
  future: mesajlarifetir),
  builder: (context ‚snapshot) {
    if (snapshot.hasData) {
    var mesailistesi = snapshot. data;
    return ListView.builder (
  );} 
  return CircularProgressIndicator(); //Add this line
})