gradle wrapper 명령어 수행 시 cnanot add task 'wrapper' as a task with that name already exists 오류 발생 시

task wrapper(type:wrapper) {
  gradleVersion = '4.4'
  distributionUrl = distributionUrl.replace("bin", "all")
}

을 아래와 같이 수정한다.

apply plugin: 'java'

sourceCompatibility = 1.8
targetCompatibility = 1.8
compileJava.options.encoding = "UTF-8"

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.springframework:spring-context:5.0.2.RELEASE'
}

wrapper {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

Cannot add task 'wrapper' as a task with that name already exists
Gradle이란??