error: cannot find symbol import com.gourav.news.databinding.ActivityDetailBindingImpl;

Do the following.

1. In Android Studio in your Build tab check which gradle task failed:

2. Select the "Gradle" tab on the top right of Android Studio:

3. Find the gradle task that failed and double-click it:

4. Let the gradle task finish and look at the output. It should say "FAILED" and some lines above that it should tell you what the problem is:

In this example the problem is, that I am using a boolean value for the visibility parameter like so: android:visibility="@{true}" when it should be an Integer, but your data binding error will most likely be something else.

5. Watch this video and take action.

This happened to me when I changed variable name in <data> but forgot to change in the views. After changing it, this error was resolved.