Unable to Build (outdated code?)

[Gabo1122]

Hello I am trying to build but I am getting this error:
1 error

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':compileJava'.

Compilation failed; see the compiler error output for details.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.5.1/userguide/command_line_interface.html#sec:command_line_warnings