Forge modding

[blackout4951]

So earlier today I had the thought of trying out forge modding (creating my own forge mod) everything was going well until I had to run the command "gradlew genEclipseRuns" I run it and it comes up with -

FAILURE: Build failed with an exception.

* What went wrong:
Unable to get mutable Windows environment variable map

* 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

Of course this is my first ever attempt at creating a mod and I'm currently only trying to understand the basics of it. I'm also expecting to run into bugs. Anyway, I downloaded forge 1.16.3 and the mdk and the javas I hold are -
jdk-14.0.2
jdk-16.0.1
jre1.8.0_291
 

I suspect it to be an issue with my javas or forge but I'm not quite sure.

All of my mdk files and folders are located at "C:\Users\User\AppData\Roaming\.minecraft\mods\Gods-and-War\gods-and-war" The was a file that ive had in there for a good while so I put all the mdk files in there.

Any support will be appreciated!!

Also I have add a picture showing my downloaded files for this! 

[DaemonUmbra]

Move your mod workspace out of .minecraft, there's no reason to put it there and it might complicate file permissions

[blackout4951]

I've moved it to a new folder and I've tried running it again but it's repeating the same thing it said earlier.

I've attached a photo so you can also see exactly what the command prompt says.

[DaemonUmbra]

It looks like Gradle is trying to use Java 16, this isn't going to work. Set JAVA_HOME to the JDK8 root and try again

[blackout4951]

Thank you! I've fixed the issue, I'll let you know if I have another issue!