i need help with error unboun prefix

[monofdr]

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:mergeDebugResources'.

java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource compilation failed
C:\app\magnetodemo\camahueto\platforms\android\app\src\main\res\xml\config.xml:31: error: unbound prefix.

but the line 31 is this

<icon gap:density="ldpi" gap:platform="android" src="icon.png" />

the xml file is this

Nuevo documento de texto.txt

[dpa99c]

The immediate error is caused because you are using an undeclared namespace - you need to declare it in your <widget> in config.xml:

<widget xmlns     = "http://www.w3.org/ns/widgets"
    xmlns:gap = "http://phonegap.com/ns/1.0"

However the gap prefix is specific to Phonegap Build - this plugin will not work with Phonegap Build as it relies on Cordova hooks scripts (unsupported by Phonegap Build).