so i tried to combine between 1.14 and 1.12 but the game crashed and didnt give me any crash report

also

if you help me to solve this proplem i can help mojang out with some bug reports

error

===============================================================================================
> Exception in thread "main" java.lang.SecurityException: SHA-256 digest error for p.class
> at sun.security.util.ManifestEntryVerifier.verify(Unknown Source)
> at java.util.jar.JarVerifier.processEntry(Unknown Source)
> at java.util.jar.JarVerifier.update(Unknown Source)
> at java.util.jar.JarVerifier$VerifierStream.read(Unknown Source)
> at sun.misc.Resource.getBytes(Unknown Source)
> at java.net.URLClassLoader.defineClass(Unknown Source)
> at java.net.URLClassLoader.access$100(Unknown Source)
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at net.minecraft.client.main.Main.main(SourceFile:56)

note 1.12.w is my custom version from 1.12 +1.14

what did i do

i have changed com and data to how old minecraft like i updated assets and META INF and net