java uses or overrides a deprecated API.

[gaurav1903]

This is the error message-
java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

I'm using flutter 1.22.6 and dart 2.10.5
when i add this package in my pubspec and build .
This error occurs and as a result text written in gradient_test is not visible