I'm using the Open IAB unitypackage v0.9.4.1 from the asset store. Billing works fine on iOS but I'm getting errors on Android. This is the logcat output:

05-22 14:15:35.990: I/Unity(13462): (Filename: ./artifacts/AndroidManagedGenerated/UnityEngineDebug.cpp Line: 53)
05-22 14:15:36.180: I/Unity(13462): ********** Android OpenIAB plugin initialized **********
05-22 14:15:36.180: I/Unity(13462):
05-22 14:15:36.180: I/Unity(13462): (Filename: ./artifacts/AndroidManagedGenerated/UnityEngineDebug.cpp Line: 53)
05-22 14:15:36.460: D/OpenIAB-UnityPlugin(13462): createBroadcasts
05-22 14:15:36.460: D/OpenIAB-UnityPlugin(13462): Starting setup.
05-22 14:15:36.690: D/OpenIAB-UnityPlugin(13462): Setup finished.
05-22 14:15:36.690: D/OpenIAB-UnityPlugin(13462): Setup successful.
05-22 14:15:36.700: I/dalvikvm(13462): Failed resolving Lorg/onepf/oms/appstore/TStoreRequestCallback; interface 3446 'Lcom/skplanet/dodo/IapPlugin$RequestCallback;'
05-22 14:15:36.700: W/dalvikvm(13462): Link of class 'Lorg/onepf/oms/appstore/TStoreRequestCallback;' failed
05-22 14:15:36.700: E/dalvikvm(13462): Could not find class 'org.onepf.oms.appstore.TStoreRequestCallback', referenced from method org.onepf.oms.appstore.TStoreBillingService.launchPurchaseFlow
05-22 14:15:36.700: W/dalvikvm(13462): VFY: unable to resolve new-instance 3850 (Lorg/onepf/oms/appstore/TStoreRequestCallback;) in Lorg/onepf/oms/appstore/TStoreBillingService;
05-22 14:15:36.700: D/dalvikvm(13462): VFY: replacing opcode 0x22 at 0x0017
05-22 14:15:36.700: I/dalvikvm(13462): Could not find method com.skplanet.dodo.IapPlugin.getPlugin, referenced from method org.onepf.oms.appstore.TStoreBillingService.startSetup
05-22 14:15:36.710: W/dalvikvm(13462): VFY: unable to resolve static method 23672: Lcom/skplanet/dodo/IapPlugin;.getPlugin (Landroid/content/Context;)Lcom/skplanet/dodo/IapPlugin;
05-22 14:15:36.710: D/dalvikvm(13462): VFY: replacing opcode 0x71 at 0x0002
05-22 14:15:36.710: I/dalvikvm(13462): Failed resolving Lorg/onepf/oms/appstore/TStoreRequestCallback; interface 3446 'Lcom/skplanet/dodo/IapPlugin$RequestCallback;'
05-22 14:15:36.710: W/dalvikvm(13462): Link of class 'Lorg/onepf/oms/appstore/TStoreRequestCallback;' failed
05-22 14:15:36.710: D/dalvikvm(13462): DexOpt: unable to opt direct call 0x63be at 0x1b in Lorg/onepf/oms/appstore/TStoreBillingService;.launchPurchaseFlow

this is our AndroidManifest (I replaced the pointy brackets so that it would show here in the post):

[?xml version="1.0" encoding="utf-8"?]
[manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.qualcomm.QCARUnityPlayer" android:versionCode="1" android:versionName="1.0"]
[uses-sdk android:minSdkVersion="9" /]
[uses-feature android:name="android.hardware.camera" /]
[supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:anyDensity="true" /]
[uses-permission android:name="android.permission.INTERNET" /]
[uses-permission android:name="android.permission.CAMERA" /]
[uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /]
[uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /]
[uses-permission android:name="com.android.vending.BILLING" /]
[uses-permission android:name="com.android.vending.CHECK_LICENSE" /]
[uses-permission android:name="android.permission.RECEIVE_SMS"/]
[uses-permission android:name="android.permission.READ_PHONE_STATE"/]
[uses-permission android:name="com.tmoney.vending.INBILLING"/]
[uses-permission android:name="com.yandex.store.permission.BILLING"/]
[uses-permission android:name="com.sec.android.iap.permission.BILLING"/]
[uses-permission android:name="org.onepf.openiab.permission.BILLING"/]
[uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /]
[uses-permission android:name="android.permission.WAKE_LOCK" /]
[application android:icon="@drawable/app_icon" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:debuggable="false"]
[activity android:name="com.neatplug.u3d.plugins.common.NPQCARUnityPlayerActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:launchMode="singleTask" android:screenOrientation="sensor"]
[intent-filter]
[action android:name="android.intent.action.MAIN" /]
[category android:name="android.intent.category.LAUNCHER" /]
[/intent-filter]
[meta-data android:name="android.app.lib_name" android:value="unity" /]
[meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" /]
[/activity]
[activity android:name="org.onepf.openiab.UnityProxyActivity" android:launchMode="singleTask" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen"]
[/activity]
[receiver android:name="com.amazon.inapp.purchasing.ResponseReceiver"]
[intent-filter]
[action android:name="com.amazon.inapp.purchasing.NOTIFY" android:permission="com.amazon.inapp.purchasing.Permission.NOTIFY" /]
[/intent-filter]
[/receiver]
[activity android:name="com.unity3d.player.VideoPlayer" android:label="@string/app_name" android:screenOrientation="sensor" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen"]
[/activity]
[activity android:name="com.facebook.unity.FBUnityLoginActivity" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen"]
[/activity]
[activity android:name="com.facebook.LoginActivity" android:screenOrientation="portrait" android:configChanges="keyboardHidden|orientation" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen"]
[/activity]
[activity android:name="com.facebook.unity.FBUnityDeepLinkingActivity" android:exported="true"]
[/activity]
[meta-data android:name="com.facebook.sdk.ApplicationId" android:value="\ 523254637782945" /]
[/application]
[/manifest]

how can this issue be resolved?