Yo, I fixed it. Just delete modpack with all backups and reinstall it.

I am getting possibly this same issue, it looks like forge is trying to load a jar that doesn't exist. Or forge is trying to load a file and the path is invalid.

This is the error message im getting ->
java.io.UncheckedIOException: java.io.IOException: Invalid paths argument, contained no existing paths: [..\..\datastore\libraries\net\minecraft\client\1.18-20211130.085255\client-1.18-20211130.085255-srg.jar, ..\..\datastore\libraries\net\minecraft\client\1.18-20211130.085255\client-1.18-20211130.085255-extra.jar, ..\..\datastore\libraries\net\minecraftforge\forge\1.18-38.0.16\forge-1.18-38.0.16-client.jar] at [email protected]/cpw.mods.jarhandling.impl.Jar.<init>(Jar.java:74) at [email protected]/cpw.mods.jarhandling.SecureJar.from(SecureJar.java:58) at MC-BOOTSTRAP/[email protected]/net.minecraftforge.fml.loading.moddiscovery.ModJarMetadata.buildFile(ModJarMetadata.java:36)