Phone gap Namespace 'gap' is not bound error

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PhoneGap

I am new to phone gap.I am getting error in config.xml.Actually i am doing paypal integration.

In config.xml it is showing phone gap namespace is not bound .

While i am running its showing Error:(117) Error parsing XML: unbound prefix

Error:Execution failed for task ':app:processDebugResources'.

com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\Sradhanjali\AppData\Local\Android\sdk\build-tools\23.0.2\aapt.exe'' finished with non-zero exit value 1
Suggest me.Thank you

Here below is the coding of config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing,
 software distributed under the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
-->
<widget xmlns     = "http://www.w3.org/ns/widgets"
        id        = "io.cordova.helloCordova"
        version   = "2.0.0">
    <name>Hello Cordova</name>

    <description>
        A sample Apache Cordova application that responds to the deviceready event.
    </description>

    <author href="http://cordova.io" email="dev@cordova.apache.org">
        Apache Cordova Team
    </author>

    <access origin="*" subdomains="true"/>


    <content src="index.html" />

    <preference name="loglevel" value="DEBUG" />
    <!--
      <preference name="splashscreen" value="resourceName" />
      <preference name="backgroundColor" value="0xFFF" />
      <preference name="loadUrlTimeoutValue" value="20000" />
      <preference name="InAppBrowserStorageEnabled" value="true" />
      <preference name="disallowOverscroll" value="true" />
    -->
    <!-- CHINU -->
    <preference name="orientation" value="portrait" />
    <preference name="orientation" value="landscape" />



    <feature name="App">
      <param name="android-package" value="org.apache.cordova.App"/>
    </feature>
    <feature name="Geolocation">
      <param name="android-package" value="org.apache.cordova.GeoBroker"/>
    </feature>
    <feature name="Device">
      <param name="android-package" value="org.apache.cordova.Device"/>
    </feature>
    <feature name="Accelerometer">
      <param name="android-package" value="org.apache.cordova.AccelListener"/>
    </feature>
    <feature name="Compass">
      <param name="android-package" value="org.apache.cordova.CompassListener"/>
    </feature>
    <feature name="Media">
      <param name="android-package" value="org.apache.cordova.AudioHandler"/>
    </feature>
    <feature name="Camera">
      <param name="android-package" value="org.apache.cordova.CameraLauncher"/>
    </feature>
    <feature name="Contacts">
      <param name="android-package" value="org.apache.cordova.ContactManager"/>
    </feature>
    <feature name="File">
      <param name="android-package" value="org.apache.cordova.FileUtils"/>
    </feature>
    <feature name="NetworkStatus">
      <param name="android-package" value="org.apache.cordova.NetworkManager"/>
    </feature>
    <feature name="Notification">
      <param name="android-package" value="org.apache.cordova.Notification"/>
    </feature>
    <feature name="Storage">
      <param name="android-package" value="org.apache.cordova.Storage"/>
    </feature>
    <feature name="FileTransfer">
      <param name="android-package" value="org.apache.cordova.FileTransfer"/>
    </feature>
    <feature name="Capture">
      <param name="android-package" value="org.apache.cordova.Capture"/>
    </feature>
    <feature name="Battery">
      <param name="android-package" value="org.apache.cordova.BatteryListener"/>
    </feature>
    <feature name="SplashScreen">
      <param name="android-package" value="org.apache.cordova.SplashScreen"/>
    </feature>
    <feature name="Echo">
      <param name="android-package" value="org.apache.cordova.Echo"/>
    </feature>
    <feature name="Globalization">
      <param name="android-package" value="org.apache.cordova.Globalization"/>
    </feature>
    <feature name="InAppBrowser">
      <param name="android-package" value="org.apache.cordova.InAppBrowser"/>
    </feature>


    <feature name="ToastPlugin">
        <param name="android-package" value="com.example.playtradewin.ToastPlugin" />
    </feature>

    <!-- Deprecated plugins element. Remove in 3.0 -->
    <plugins>
        <gap:plugin name="com.paypal.cordova.mobilesdk" version="3.1.8" />
    </plugins>


</widget>