[Can someone help me solve a problem]

MC version is 1.12.2 forge version is 14.23.3.2655-mdk

[Can someone help me solve a problem]

I've been trying to run the command gradlew setupDecompWorkspace  to begin creating my mod since last night and i keep getting this error, i don't know if it's derpiness on my part or if you all need to look into this but here's the error that's been bugging me

 

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Users\roblo\Documents\Minecraft Modding\Gemology\build.gradle' line: 10

* What went wrong:
A problem occurred evaluating root project 'Gemology'.
> Plugin with id 'net.minecraftforge.gradle.forge' not found.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 7.269 secs

C:\Users\roblo\Documents\Minecraft Modding\Gemology>

 

any and all help in resolving this issue would be much appreciated thank you