How to configure gradle to download build script dependencies from local repository

Question

I'm trying to declare the dependencies which will be used during execution of gradle Tasks in the buildScript. I want to make gradle to find these dependencies from local directory. So, I have configured the repository to refer to my local directory where I have kept all the downloaded jars. But when i execute the build, it says, It can't resolve all the dependencies. Below is the error.

Could not resolve all artifacts for configuration ':classpath'. Could not download proguard-gradle-7.1.0.jar (com.guardsquare:proguard-gradle:7.1.0) > Could not get resource 'https://plugins.gradle.org/m2/com/guardsquare/proguard-gradle/7.1.0/proguard-gradle-7.1.0.jar'. > Could not GET 'https://plugins.gradle.org/m2/com/guardsquare/proguard-gradle/7.1.0/proguard-gradle-7.1.0.jar'. > plugins.gradle.org Could not download proguard-base-7.1.0.jar (com.guardsquare:proguard-base:7.1.0) > Could not get resource 'https://plugins.gradle.org/m2/com/guardsquare/proguard-base/7.1.0/proguard-base-7.1.0.jar'. > Could not GET 'https://plugins.gradle.org/m2/com/guardsquare/proguard-base/7.1.0/proguard-base-7.1.0.jar'. > plugins.gradle.org Could not download proguard-core-7.1.0.jar (com.guardsquare:proguard-core:7.1.0) > Could not get resource 'https://plugins.gradle.org/m2/com/guardsquare/proguard-core/7.1.0/proguard-core-7.1.0.jar'. > Could not GET 'https://plugins.gradle.org/m2/com/guardsquare/proguard-core/7.1.0/proguard-core-7.1.0.jar'. > plugins.gradle.org Could not download kotlinx-metadata-jvm-0.1.0.jar (org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0) > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlinx/kotlinx-metadata-jvm/0.1.0/kotlinx-metadata-jvm-0.1.0.jar'. > Could not GET 'https://plugins.gradle.org/m2/org/jetbrains/kotlinx/kotlinx-metadata-jvm/0.1.0/kotlinx-metadata-jvm-0.1.0.jar'. > plugins.gradle.org Could not download kotlin-stdlib-1.3.72.jar (org.jetbrains.kotlin:kotlin-stdlib:1.3.72) > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-stdlib/1.3.72/kotlin-stdlib-1.3.72.jar'. > Could not GET 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-stdlib/1.3.72/kotlin-stdlib-1.3.72.jar'. > plugins.gradle.org Could not download kotlin-stdlib-common-1.3.72.jar (org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72) > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-stdlib-common/1.3.72/kotlin-stdlib-common-1.3.72.jar'. > Could not GET 'https://plugins.gradle.org/m2/org/jetbrains/kotlin/kotlin-stdlib-common/1.3.72/kotlin-stdlib-common-1.3.72.jar'. > plugins.gradle.org

Can anyone please help me in resolving this?

    repositories {
        flatDir {
            dirs "/repo/common/java/libs/engine",
                    "/repo/common/java/libs/build"
        }
        //mavenCentral()
    }
    dependencies {
        classpath 'com.guardsquare:proguard-gradle:7.1.0'
        classpath 'com.guardsquare:proguard-base:7.1.0'
        classpath 'com.guardsquare:proguard-core:7.1.0'
        classpath 'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0'
        classpath 'org.jetbrains.kotlin:kotlin-stdlib:1.3.72'
        classpath 'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72'
    }
} ```