TypeError Cannot read property 'length' of undefined

[annYang66]

having this error while build app to my android phone(using Visual Studio 2015)

Warning: Failed to install 'phonegap-nfc':TypeError: Cannot read property 'length' of undefined at myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:381:23 at Array.forEach (native) at is_conflicting (myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:355:17) at PlatformMunger.add_plugin_changes (myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:150:33) at myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\PluginManager.js:126:25 at _fulfilled (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:834:54) at self.promiseDispatch.done (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:863:30) at Promise.promise.promiseDispatch (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:796:13) at myCordovaApp\platforms\android\cordova\node_modules\q\q.js:857:14 at runSingle (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:137:13) C:\Users\123\AppData\Roaming\npm\node_modules\vs-tac\node_modules\q\q.js:126 throw e; ^ TypeError: Cannot read property 'length' of undefined at myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:381:23 at Array.forEach (native) at is_conflicting (myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:355:17) at PlatformMunger.add_plugin_changes (myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:150:33) at myCordovaApp\platforms\android\cordova\node_modules\cordova-common\src\PluginManager.js:126:25 at _fulfilled (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:834:54) at self.promiseDispatch.done (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:863:30) at Promise.promise.promiseDispatch (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:796:13) at myCordovaApp\platforms\android\cordova\node_modules\q\q.js:857:14 at runSingle (myCordovaApp\platforms\android\cordova\node_modules\q\q.js:137:13)

im using Cordova cli 6.3.0

while use config.xml to install phonegap nfc plugin in VS 2015, it shows a column NFC_USEAGE_DESCRIPTION, is it needed to fill? can't find what to fill in README.

[don]

I need to document NFC_USAGE_DESCRIPTION. It's for iOS to display to the user when requesting NFC permissions.

If you specify NFC_USAGE_DESCRIPTION when installing the plugin

cordova plugin add phonegap-nfc --variable NFC_USAGE_DESCRIPTION="Scan NFC Tags"

It adds this info into config.xml

<plugin name="phonegap-nfc" spec="^1.0.3">
    <variable name="NFC_USAGE_DESCRIPTION" value="Scan NFC Tags" />
</plugin>

I'm not sure what's causing the stack trace. I tried downgrading to cordova@6.3.0 and test on my mac, but the old version won't run without downgrading Gradle.

Suggestions

• Upgrade to cordova cli 8.0.0 npm install -g cordova
• Make sure you're running Nodejs 8.11.x
• Upgrade the native code to cordova-android-7.0.0 (use cordova to remove and install the platform)

If you can't upgrade Cordova, see if an older version of the plugin works better

cordova plugin rm phonegap-nfc
cordova plugin add phonegap-nfc@0.7.3

Let me know if any of that works (or doesn't).

[annYang66]

i use cordova plugin add phonegap-nfc@0.7.3 and it works. thx!