Trying to setup Eclipse for Minecraft modding [closed]

I've been trying to get into minecraft modding for the past few weeks and can't seem to get past the first step, setting up a workspace with eclipse. First I had to realize that tutorials on the matter said to use the setupDecompWorkspace command, which I now know to be deprecated- that was an easy fix.

Now that I'm past most of the setup process I've hit a brick wall. when trying to run the game with runClient I get the following message https://prnt.sc/1gnm5gg

note that these are the things I've checked and tried:

• Ensuring that I have the proper forge version, which in my case is 1.12.2
• Setting my installed JRE and execution environment to the proper JDK1.8
• Set MC_VERSION to 1.12 and Working directory to 'rootFolder'\run
• done gradlew genEclipseRun and gradlew eclipse to setup the proper folders
• tried adding a 'main' function to the example mod (It is removed in this instance but it didn't work either)

Every tutorial I can find suggests doing one of these things, with no avail, I've been at this for days and need some assistance. Any help is incredibly appreciated!