[1.16.X] How To Update Mod?

[Aldraxic]

Hey newbie forge modder here; Wondering how, if possible I could port a mod from 1.7.10 to newer versions of MineCraft 1.16.X/1.15.X; As it is currently, I'm receiving the following errors;

A problem occurred evaluating root project 'Minechem-1.7.10-v6'.
> Failed to apply plugin 'forge'.
   > Could not create task ':reobf'.
      > Could not create task of type 'ReobfTask'.
         > 'org.gradle.api.tasks.TaskInputs org.gradle.api.tasks.TaskInputs.files(java.lang.Object[])'

My build.gradle is as follows;

buildscript {
    repositories {
        mavenCentral()
        jcenter()
        maven {
            name = "forge"
            url = "http://files.minecraftforge.net/maven"
        }
        maven {
            // Add maven repo for SpecialSource
            name = "sonatype"
            url = "https://oss.sonatype.org/content/repositories/snapshots/"
        }
    }
    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:1.2-SNAPSHOT'
        classpath 'de.undercouch:gradle-download-task:1.2'
    }
}

apply plugin: 'forge'
apply plugin: 'maven'
apply plugin: 'maven-publish'
apply plugin: 'de.undercouch.download'

ext.buildProps = file "build.properties"

buildProps.withReader {
    def prop = new Properties()
    prop.load(it)
    ext.config = new ConfigSlurper().parse prop
}

repositories {
    maven {
        name = "forge"
        url = "http://files.minecraftforge.net/maven"
    }
    maven { // the repo from which to get NEI and stuff
        name 'CB Repo'
        url "http://chickenbones.net/maven"
    }
    ivy {
        name 'FMP'
        artifactPattern "http://files.minecraftforge.net/[module]/[module]-dev-[revision].[ext]"
    }
	maven {
		// OpenComputers maven repo
		url = "http://maven.cil.li/"
	}
}

dependencies {
    compile group: 'codechicken', name: 'NotEnoughItems', version: "${config.version.minecraft}-${config.version.cc.nei}", ext: 'jar', classifier: "dev"
    compile group: 'codechicken', name: 'CodeChickenCore', version: "${config.version.minecraft}-${config.version.cc.core}", ext: 'jar', classifier: "dev"
    compile group: 'codechicken', name: 'CodeChickenLib', version: "${config.version.minecraft}-${config.version.cc.lib}", ext: 'jar', classifier: "dev"
    compile group: 'li.cil.oc', name: 'OpenComputers', version: "MC${config.version.minecraft}-${config.version.oc.api}-dev", ext: 'jar', classifier: "api"
    compile fileTree(dir: 'libs', include: '*.jar')
    compile fileTree(dir: 'libs', include: '*.zip')
}

group = "minechem"
archivesBaseName = "Minechem"

minecraft {
    version = "${config.version.forge}-${config.version.minecraft}"

    replace "@MAJOR@", config.version.mod.major
    replace "@MINOR@", config.version.mod.minor

    if (System.getenv("BUILD_NUMBER") != null) {
        replace "@BUILD@", System.getenv("BUILD_NUMBER")
    }
    else
    {
        replace "@BUILD@", "ManuallyBuilt"
    }
}

processResources {
    from 'build.properties'
}

allprojects {
    version = "${config.version.minecraft}-${config.version.mod.major}.${config.version.mod.minor}"

    if (System.getenv("BUILD_NUMBER") != null) {
        version += ".${System.getenv("BUILD_NUMBER")}"
    } else {
        version += "-ManuallyBuilt"
    }

    jar {
    	manifest {
			attributes 'FMLCorePlugin': 'minechem.asm.LoadingPlugin'
			attributes 'FMLCorePluginContainsFMLMod': 'true'
		}
        destinationDir = file (rootProject.getRootDir().getPath() + '/output')
    }

    publishing {
        publications {
            mavenJava(MavenPublication) {
                artifact jar
            }
        }
        repositories {
            maven {
                url "file://var/www/maven"
            }
        }
    }
}

sourceSets {
    main {
        resources {
            exclude '**/xcf/*'
            exclude 'resources/assets/minechem/xcf'
        }
        java {
            srcDir 'src/fontbox/src/main/java'
        }
    }
}

import de.undercouch.gradle.tasks.download.Download

task getLibraries {
    def libsFolder = new File('libs')
    if (!libsFolder.isDirectory() ) {
        libsFolder.mkdirs()
    }

	def ccSource = 'http://minecraft.curseforge.com/mc-mods/67504-computercraft/files/2216236/download'
	def ccDest = new File('libs', 'ComputerCraft-1.65.jar')


	if(!ccDest.exists() ){
		download {
			src ccSource
			dest ccDest
		}
	}

    def mtSource = 'http://minetweaker3.powerofbytes.com/download/MineTweaker3-Dev-1.7.10-3.0.9C.jar'
    def mtDest = new File('libs', 'MineTweaker3-Dev-1.7.10-3.0.9C.jar')

    if(!mtDest.exists() ){
        download {
            src mtSource
            dest mtDest
        }
    }

    def cofhSource = 'http://minecraft.curseforge.com/mc-mods/220333-cofhlib/files/2233833/download'
    def cofhDest = new File('libs', 'CoFHLib-1.7.10-1.0.1-151-dev.jar')

    if(!cofhDest.exists() ){
        download {
            src cofhSource
            dest cofhDest
        }
    }
}

task apiZip(type: Zip) {
    classifier = 'api'
    from sourceSets*.allSource
    include 'minechem/api/**'
    destinationDir = file 'output'
}

build.dependsOn "apiZip", "getLibraries"

As for the build.properties ~ (I've attempted upgrading forge version, however no success in doing so);

version.minecraft=1.7.10
version.forge=10.13.3.1388
version.mod.major=6
version.mod.minor=0
version.cc.core=1.0.4.29
version.cc.lib=1.1.1.104
version.cc.nei=1.0.4.83
version.oc.api=1.4.3.313

Many thanks for the assistance.

Edited January 8, 2021 by Aldraxic

[DaemonUmbra]

You're better off rewriting the whole thing from scratch