[1.12.2] Cannot start daemon process

[That_Martin_Guy]

My friend is trying to setup a workspace for forge, but he gets the following error every time he runs setupDecompWorkspace;

FAILURE: Build failed with an exception.

* What went wrong:
Unable to start the daemon process.
This problem might be caused by incorrect configuration of the daemon.
For example, an unrecognized jvm option is used.
Please refer to the user guide chapter on the daemon at https://docs.gradle.org/2.14/userguide/gradle_daemon.html
Please read the following process output to find out more:
-----------------------
Error occurred during initialization of VM
Could not reserve enough space for 3145728KB object heap

According to task manager he has more than 3G (almost 4G) of RAM available, which should be enough according to the gradle properties file;

# Sets default memory used for gradle commands. Can be overridden by user or command line properties.
# This is required to provide enough memory for the Minecraft decompilation process.
org.gradle.jvmargs=-Xmx3G

Full stacktrace

[DaemonUmbra]

Solved in Discord, his JAVA_HOME was pointing at a 32-Bit JDK.