Gradle Decomp Error

[Elpouletto]

Hi ! I am a French boy and I have a problem when I use this command for decompil gradle : gradlew setupDecompWorkspace

The version of forge : 1.12.2-14.23.5.2855

The error:

FAILURE: Build failed with an exception.

* What went wrong:
Task 'setupDecompWorkspace' not found in root project 'FirstMod'.

* Try:
Run gradlew tasks to get a list of available tasks. 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 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.9/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 4m 13s

 

Help me please. And sorry for my english if he is bad.