When i want to start " gradlew genEclipseRuns " They give me this :

FAILURE: Build failed with an exception. > root project

root project

• Where:
  Build file 'F:\Minecraft\inventory-tweaks-develop\build.gradle' line: 132

• What went wrong:
  A problem occurred evaluating root project 'inventory-tweaks-develop'.

You must specify the full forge version, including MC version in your build.gradle. Example: 1.12.2-14.23.5.2811

• 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

BUILD FAILED in 1s

You can just edit the line in gradle.properties if needed, forge seems to keep changing how you need to write that.