我想编译这个gradle项目：

buildscript {
    repositories {
        mavenCentral()
        maven {
            url 'https://repo.spring.io/milestone'
        }
        maven {
            url "https://maven.springframework.org/release"
        }
    }
}
plugins {
    id 'java'
    id 'io.spring.dependency-management' version '1.0.10.RELEASE'
}
apply plugin: "io.spring.dependency-management"
group 'org.example'
version '1.0.0'
dependencyManagement {
    imports {
        mavenBom 'org.springframework.cloud:spring-cloud-dependencies:2020.0.2'
    }
}
dependencies {
    compile "io.jsonwebtoken:jjwt:0.9.1"
    compile "org.springframework.cloud:spring-cloud-starter-netflix-eureka-client"    
    compile "org.springframework.cloud:spring-cloud-netflix-hystrix"
    compile "org.springframework.cloud:spring-cloud-starter-gateway"
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
}
test {
    useJUnitPlatform()
}

但我在编译项目时出错了：

Cannot resolve external dependency org.springframework.cloud:spring-cloud-starter-netflix-eureka-client because no repositories are defined.
Required by:
    project :

你知道我怎么解决这个问题吗？