This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Is this caused be a taglib using a prefix p (eg <p:taglibExample/>), or an actual
If the former, then you need to declare the taglibrary in your page. eg <%@ taglib uri="http://com.mycompany/my/taglib" prefix="p"%>
If the latter, then I'm not 100% sure what can cause this.
Where are you seeing this message?
In your browser?
Is this a warning/message from your IDE?
Is it compile time? runtime error?
Can you give us an example?
What sort of file are you writing?
Are you writing html documents in strict xml syntax ie xhtml?