mcmod.info:

[
{
  "modid": "cdmrb",
  "name": "ChingDim Misc:Rare Beam",
  "description": "Being coded by ChingDim,Rare Beam is actually the first mod written by ChingDim.\This mod is designed to have miscellaneous items,and random things.",
  "version": "0.1-pre-2",
  "mcversion": "${mcversion}",
  "url": "github.com/Arkyo/ChingDimMods/tree/Misc-RareBeam",
  "updateUrl": "https://arkyo.github.io/mods/rarebeam/Update.json",
  "authorList": ["ChingDim"],
  "credits": "",
  "screenshots": [],
  "dependencies" :[]
}
]

 

build.gradle:

buildscript {
    repositories {
        jcenter()
        maven { url = "http://files.minecraftforge.net/maven" }
    }
    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.2-SNAPSHOT'
    }
}
apply plugin: 'net.minecraftforge.gradle.forge'

version = "0.1-pre-2"
group= "com.chingdim.misc_rarebeam" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
archivesBaseName = "cdmrb"

sourceCompatibility = targetCompatibility = "1.6" // Need this here so eclipse task generates correctly.
compileJava {
    sourceCompatibility = targetCompatibility = "1.6"
}

minecraft {
    version = "1.10.2-12.18.3.2422"
    runDir = "run"
    mappings = "snapshot_20161111"
}

dependencies {
    
}

processResources
{
    // this will ensure that this task is redone when the versions change.
    inputs.property "version", project.version
    inputs.property "mcversion", project.minecraft.version

    // replace stuff in mcmod.info, nothing else
    from(sourceSets.main.resources.srcDirs) {
        include 'mcmod.info'
        expand 'version':project.version, 'mcversion':project.minecraft.version
                
        // replace version and mcversion
        expand 'version':project.version, 'mcversion':project.minecraft.version
    }
        
    // copy everything else, thats not the mcmod.info
    from(sourceSets.main.resources.srcDirs) {
        exclude 'mcmod.info'
    }
}

 

Can't helps solve the problem without knowing the error you are getting....however, you are doing the token replacement twice...

expand 'version':project.version, 'mcversion':project.minecraft.version