----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Vapi Flutter SDK]() * [Client SDKs]() * [Create Phone Call]() * [Create Assistant]() -----------------------------

### Answer It seems like you're encountering issues with initializing the Vapi client in your Flutter application. This error typically occurs due to a problem with the setup or configuration. Here are a few steps you can take to troubleshoot and resolve the issue: 1. **Check your API Key**: Ensure that the Public Key you are using to initialize the Vapi client is correct and active. 2. **Verify Permissions**: Ensure that all required permissions are correctly set in your app manifest. For Android, you should have permissions for internet, record audio, and modify audio settings specified in your

AndroidManifest.xml

[(1)]() . 3. **Review SDK Setup**: Ensure that you've followed all the setup instructions correctly for integrating the Vapi SDK in your Flutter project. This includes adding the Vapi dependency and configuring it correctly in your project's

pubspec.yaml

file. Here is a basic example of how to initialize the Vapi client in Flutter, which might help you identify any discrepancies in your implementation:

dart
import 'package:vapi/vapi.dart';

void main() {
  var vapi = Vapi('your-public-key');

  try {
    vapi.start(assistantId: "your-assistant-id");
  } catch (error) {
    print("Failed to start Vapi client: $error");
  }
}

Make sure that your network is stable and that the Vapi services are operational at the time of your requests. You can check the Vapi status page for any ongoing issues. If the problem persists after checking these areas, you might want to look deeper into the logs or errors provided by the SDK to get more specific guidance on what might be going wrong.