Android Studioで Gradle DSL method not found: 'compile()'が起きた

Android Studioでビルドしようとしたら、こんなエラーが

Error:(47, 0) Gradle DSL method not found: 'compile()'
Possible causes:<ul><li>The project 'XXXXXXX' may be using a version of Gradle that does not contain the method.
<a href="openGradleSettings">Gradle settings</a></li><li>The build file may be missing a Gradle plugin.
<a href="apply.gradle.plugin">Apply Gradle plugin</a></li>

build.gradle

dependencies {
...
    compile "com.android.support:support-v4:${SUPPORT_LIB_VER}"    compile "com.android.support:appcompat-v7:${SUPPORT_LIB_VER}"
    compile "com.android.support:support-annotations:${SUPPORT_LIB_VER}"
    compile "com.android.support:design:${SUPPORT_LIB_VER}"
...
}

改行がなくなってて、２行が一行になってた。
１０分くらい気づかなかった…