我已将android studio更新为Android Studio 4.0.1，但出现错误消息，
Gradle sync failed: Could not download lint-gradle-api-27.0.1.jar (com.android.tools.lint:lint-gradle-api:27.0.1): No cached version available for offline mode
Consult IDE log for more details (Help | Show Log) (1 s 859 ms)
可能是什么错误？