Hey, I encountered some problems. I think this is a really great mod and I don't wanna skip it so easily. Anyhow, first problem was on your official site. When trying to download the file from there it give an " server error 500 ". ( this wasn't the real issue since I could download form curse forge but I wanted to let you know c: )The second was, my minecraft client boots up in a normal way, but when I try to run the server it crashes at some point while loading. Fairly close to the start, I don't think it even gets to loading the world. (I deleted the world file so it creates a new one while loading )I'm gonna include the server crash log in the if it can help you figure it out in any way.
I'm on forge 14.23.5.2838 minecraft 1.12.2.

crash-2019-06-02_08.14.02-server.txt

Caused by: java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source) ~[?:1.8.0_211]
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source) ~[?:1.8.0_211]
at java.lang.AbstractStringBuilder.append(Unknown Source) ~[?:1.8.0_211]
at java.lang.StringBuilder.append(Unknown Source) ~[?:1.8.0_211]
at net.minecraft.crash.CrashReportCategory.func_85072_a(CrashReportCategory.java:180) ~[c.class:?]
at net.minecraft.crash.CrashReport.func_71506_a(CrashReport.java:160) ~[b.class:?]
at net.minecraft.crash.CrashReport.func_71502_e(CrashReport.java:229) ~[b.class:?]
at net.minecraft.client.Minecraft.func_71377_b(Minecraft.java:759) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:383) ~[bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) ~[Main.class:?]
... 14 more

Give it a bit more memory on startup.

#1132

Try Forge 1.12.2-14.23.0.2491 with only MCA installed. Odd that a normally included library isn't found. Could have been removed in the later version of Forge you're using.

-Forge 1.12.2-14.23.0.2491
-Clean install
-Freezes on load
-https://paste.ee/p/tgFZW