why shows me this warning: prefix p but no taglibrary exists for that namespace.

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Java

hi,

Trying to test my web app, no appears any primeface control and shows me this warning in my web page

Warning: This page calls for XML namespace http://primefaces.org/ui declared with prefix p but no taglibrary exists for that namespace.

I searched problems in the pom file

 <repositories>
	<repository>  
	    <id>prime-repo</id>  
	    <name>PrimeFaces Maven Repository</name>  
	    <url>http://repository.primefaces.org</url>  
	    <layout>default</layout>  
	</repository>
</repositories>	
.
.
.
.
  <dependencies>
		<dependency>
			<groupId>com.sun.faces</groupId>
			<artifactId>jsf-api</artifactId>
			<version>2.2.2</version>
			<scope>provide</scope>
		</dependency>
		
		<dependency>
			<groupId>com.sun.faces</groupId>
			<artifactId>jsf-impl</artifactId>
			<version>2.2.2</version>
			<scope>provide</scope>
		</dependency>

		<dependency>  
		    <groupId>org.primefaces</groupId>  
		    <artifactId>primefaces</artifactId>  
		    <version>5.1</version>
			<scope>provide</scope> 
		</dependency>

the web.xml file...

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>webtest</display-name>
  <display-name>primefaces</display-name>


  <context-param>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Development</param-value>
  </context-param>
 
  <welcome-file-list>
    <welcome-file>index.xhtml</welcome-file>
  </welcome-file-list>

  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
 
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.jsf</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.faces</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.xhtml</url-pattern>
  </servlet-mapping>

I really don´t know what happen!!!