PayPal-Cordova-Plugin Cannot find symbol Version

I've downloaded and installed the PayPal-Cordova-Plugin on my ionic/cordova project.

When I try to build the project I get this error:

-compile:
    [javac] Compiling 4 source files to /home/guy/Projects/TreatsForLife/mobile/platforms/android/ant-build/classes
    [javac] /home/guy/Projects/TreatsForLife/mobile/platforms/android/src/com/paypal/cordova/sdk/PayPalMobileCordovaPlugin.java:67: error: cannot find symbol
    [javac]         this.callbackContext.success(Version.PRODUCT_VERSION);
    [javac]                                      ^
    [javac]   symbol:   variable Version
    [javac]   location: class PayPalMobileCordovaPlugin
    [javac] 1 error

I've did some search and found this line in the plugin.xml file

<engines><engine name="cordova" version="&gt;=3.0.0" /></engines>

I changed it to what I think is supposed to be there:

<engines><engine name="cordova" version=">=3.0.0" /></engines>

But still, the same error occurs.

Does someone know how to fix this?