Could not set unknown property 'runDir'. I need help right now. I'm at a dead end

[tryhuiiy]

FAILURE: Build failed with an exception.

• Where:
  Build file 'C:\Users\Damgh\Downloads\OpenComputersX86-master\OpenComputersX86-master\build.gradle' line: 23

• What went wrong:
  A problem occurred evaluating root project 'OpenComputersX86-master'.

Could not set unknown property 'runDir' for root project 'OpenComputersX86-master' of type org.gradle.api.Project.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.0/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 4s

this is a 10 yr old mod using forge gradle 4.0.1 that was originally on gradle 2.0 and forgegradle 1.2 so imma put my build.gradle file here. yes i removed anything that got in my way and now im at a dead end

buildscript {
repositories {
mavenCentral()
maven {
name = "forge"
url = "https://maven.minecraftforge.net/"
}
maven {
name = "sonatype"
url = "https://oss.sonatype.org/content/repositories/snapshots/"
}
maven { url "http://jcenter.bintray.com" }
}
dependencies {
classpath 'net.minecraftforge.gradle:ForgeGradle:4.0.1'
}
}
version = "-1.16.5-0.1.0"
group= "lperkins2.ocx86" // http://maven.apache.org/guides/mini/guide-naming-conventions.html

minecraft (
version = "1.16.5-36.2.42"
runDir = "eclipse/assets"
)

apply plugin: 'forge'

// you may put jars on which you depend on in ./libs
// or you may define them like so..
//compile "some.group:artifact:version:classifier"
//compile "some.group:artifact:version"
  
// real examples
//compile 'com.mod-buildcraft:buildcraft:6.0.8:dev'  // adds buildcraft to the dev env
//compile 'com.googlecode.efficient-java-matrix-library:ejml:0.24' // adds ejml to the dev env

// for more info...
// http://www.gradle.org/docs/current/userguide/artifact_dependencies_tutorial.html
// http://www.gradle.org/docs/current/userguide/dependency_management.html
compile files("libs/OpenComputers-MC1.7.10-1.5.2.9-universal.jar") {
    builtBy "fakecompile"
}
compile files("jpc/src/org/")
compile files("OCLights2/src/main/java/ds/")

task fakecompile << {
println 'fake compiling classes'
}

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'
            
    // 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'
}

}

buildscript {
repositories {
maven { url = 'https://maven.minecraftforge.net/' }
mavenCentral()
}
dependencies {
classpath 'net.minecraftforge.gradle:ForgeGradle:4.0.1'
}
}

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