Gradle dependencies 오류 ㅠㅠ

안녕하세요 카카오내비 사용하려고 하는데 세팅부터 계속 막힙니다. ㅠㅠ
처음에 내부망에서 해서 안되길래 방화벽 문제인가 싶어 외부망에서 하는데도 안되네요…
일주일째 고생중입니다…

project build.gradle
buildscript {
repositories {
jcenter ()
}
dependencies {
classpath ‘com.android.tools.build:gradle:3.0.1’
}
}

allprojects {
repositories {
jcenter ()
maven Central()
maven {
url “http://devrepo.kakao.com:8088/nexus/content/groups/public/
}
}
}

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

app build.gradle
dependencies {
compile fileTree(dir: ‘libs’, include: [’*.jar’])
compile group: ‘com.kakao.sdk’, name: ‘kakaonavi’, version: ‘1.9.0’
compile ‘com.google.android.gms:play-services:7.5.0’
}

compileSdkVersion 25
buildToolsVersion “26.0.2”

로 세팅해놨는데 자꾸

Could not resolve com.kakao.sdk:kakaonavi:1.9.0.
Could not get resource ‘http://devrepo.kakao.com:8088/nexus/content/groups/public/com/kakao/sdk/kakaonavi/1.9.0/kakaonavi-1.9.0.pom
Network is unreachable (connect failed)

에러 문구가 뜹니다…

도와주세요 …