'FormatException: Invalid envelope in flutter Firebase Cloud Functions

I'm trying to call firebase functions from my flutter application for saving an image in firestore.

I am using the following code to upload my image data, But i'm receiving the error FormatException: Invalid envelope

_image = image.readAsBytes();
CloudFunctions.instance.call(
    functionName: 'updateUserImg',
    parameters: <String, dynamic>{
      'img':_image,
    },
  );

My cloud function is not even getting called, seems like i'm sending the data in wrong format.

How I can fix this issue?

Thanks.

dart flutter

Solution 1:^[1]

This issue generally comes when your device (Emulator or Mobile) is not having an internet connection.

Make sure your laptop/PC is connected with Wifi i.e. it is having an active internet connection.
Make sure your emulator/device has the Wifi and/or Mobile data ON.

Update: (24th May)

Sometimes, if I switch to a different Wifi/Internet connection , then emulator shows this error. The solution to this is after switching to different Wifi/Internet connection, cold boot your emulator, when you start debugging.

Note: This option is shown when all emulators are closed and you click on Run --> Start Debugging on Visual Studio

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Source: Stack Overflow

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Solution 1

'FormatException: Invalid envelope in flutter Firebase Cloud Functions

Solution 1:[1]

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Solution 1:^[1]