Unable to load class 'com.android.build.gradle.internal.transforms.ProGuardTransform'

[Vegen]

按照文档来，新建了一个工程，在根目录下配置 build.gradle，报一下错：
build.gradle (project: SmallStudy)

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.4.32"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.3"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'net.wequick.tools.build:gradle-small:1.5.0-beta2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

apply plugin: 'net.wequick.small'

small {
    aarVersion = '1.5.0-beta2'
}

报错信息：

Unable to load class 'com.android.build.gradle.internal.transforms.ProGuardTransform'.

This is an unexpected error. Please file a bug containing the idea.log file.

请问这怎样解决，第一步就报错了