Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction preprocess failed: [Error Code: 1101] cadence runtime error: Execution failed:
error: cannot assign to `message`: field has public access
 --> 487366777c4854ab2803d0c262cf66e7d3c588843e28b8b63c92d25f79b83113:6:21
  |
6 |         MessageBoard.message = "HI"
  |                      ^^^^^^^ consider making it publicly settable with `pub(set)`