各位大神，我请教一个问题，我在Android studio上创一个project显示错误

Error:FAILURE: Build failed with an exception. * Where: Build file 'C:\Users\Administrator\AndroidStudioProjects\MyApplication\build.gradle' line: 26 * What went wrong: A problem occurred evaluating root project 'MyApplication'. > Could not find method implementation() for arguments [com.android.support:appcompat-v7:26.0.0-beta1] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. * Get more help at https://help.gradle.org