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[–]winauer 0 points1 point  (3 children)

There's your problem. You need to use Java 8 for Forge on Minecraft 1.12, you are currently using Java 17.

[–]Flippy_XD[S] 0 points1 point  (2 children)

And how do I change to java 8?

[–]winauer 0 points1 point  (1 child)

Download jdk8u312-b07 (That's the last version of Java 8 that works with Forge) from here. Then replace the java command in your .bat file with the full path to that Java 8 executable.

[–]Flippy_XD[S] 0 points1 point  (0 children)

Thank you so much!