Problem with flutter web and dart2js

[bobosette]

Hi everybody.
I have this issue that don't allow me to build for the web.

Target dart2js failed: Exception: Warning: The 'dart2js' entrypoint script is deprecated, please use 'dart compile js' instead.
Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:

• package:ai_barcode

How can i fix it?
Thank you