安卓项目突然运行不了

failed
:app:writeDebugSigningConfigVersions
org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':PullToRefresh:debugCompileClasspath'.
org.gradle.internal.resolve.ModuleVersionNotFoundException: Could not find com.android.support:support-v4:22.2.1.
org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':app:debugRuntimeClasspath'.

这个该怎么解决啊？谢谢！

应该是build gradle版本没有对应