The argument type 'String?' can't be assigned to the parameter type 'String' because 'String?' is nullable and 'String' isn't.

[jatin-web]

Describe the bug
I am getting this bug when I tried to run the basic code copied from agora_uikit package.

To Reproduce
Steps to reproduce the behavior:

1. Add the package to your project
2. Add the Code mentioned in the package documentation in pub dev
3. Run the project

Expected behavior
Should run the project

Screenshots

[ardeshir-33033]

I added userName to my AgoraClient and fixed this.
AgoraClient(
agoraConnectionData: AgoraConnectionData(
appId: appId,
channelName: callName!,
tempToken: token,
uid: calleeId,
username: callName!),
);

although I did not even updated my Agora package. I did see this bug but the problem is after I added this I get this error.

AgoraRtmChannel sendMessage failed errorCode: 102