1.12.2 Forge Server File Can't Be Launched (MAC)

[POTATO1]

Help. 

"The Java JAR file "forge-1.12.2-14.23.5.2847-universal.jar" could not be launched."

This message pops up every time, and I have no clue on how to properly open it so that files can be loaded in and I can try setting up a modded sever. Also, I'm doing this on a Mac desktop. Any suggestions?

[LexManos]

1.12 is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.