I can't seem to open this .jar file. Can someone make sense out of my error message? I'm trying to set up a modded minecraft server on my Mac.
I am on Mojave 10.14.6 and I have Java SE Oracle JDK 15.0.1 installed.
Each time I attempt to open the file forge-1.12.2-14.23.5.2854-universal.jar I get prompted  with a warning &quot;The Java JAR file &quot;forge-1.12.2-14.23.5.2854-universal.jar&quot; could not be launched.&quot; 
I also tried opening it with Terminal, relocating the directory and inputting java -jar forge-1.12.2-14.23.5.2854-universal.jar but here, i got the error back.
Unfortunately, I am unable to read code. I've done my researched and found multiple others with the same problem but they all had to do with their MANIFEST.MF file, I don't believe that is my case here, from the minimal info I could make out of the error message, I was wondering if anyone can help me find out what is the problem and how I can fix it. Thanks!
It works, I just have to update my java. sigh.