This only affects 6.2.x. NOTE: This seems only happens when the first time user adding a page by pasting the page name.
Steps to reproduce:
- Login Liferay bundle.
- Click the Plus icon on the page.
- Click Page, paste a page name into the name field.
- Click Save.
The new page can be added successfully.
Fail to add the new page with a message said " Please enter a valid name. ".