What the actual meaning `Caused by: java.lang.RuntimeException: view must have a tag`?

Question

Please inform me if knowing whats tag that wanted.

Caused by: java.lang.RuntimeException: view must have a tag

__BaseActivity.java

Answer 1

Usually happens while learning about data binding in android, we usually use a main_activity.xml and then include content_main.xml but we by mistake put the tag in content file. We need to put this and tag in parent file that is used in setContentView()