Invoking JNI functions in Android package name containing underscore

I am trying to implement MP3 encoding in Android using the LAME library following these guides: Lame MP3 Encoder compile for Android http://developer.samsung.com/android/technical-docs/Porting-and-using-LAME-MP3-on-Android-with-JNI

However I am getting a java.lang.UnsatisfiedLinkError which I believe might be due to the fact that my package name contains an underscore which it interprets as a full stop .

Looking at my code below is this likely this issue and how do I get around that. Or is there something else causing this. Thanks in advance for any help.

Record.java:

package co.uk.ing_simmons.aberdeensoundsites;

public class Record extends Activity implements OnClickListener {

static {
    System.loadLibrary("mp3lame");
}

private native void initEncoder(int numChannels, int sampleRate, int bitRate, int mode, int quality);

private native void destroyEncoder();

private native int encodeFile(String sourcePath, String targetPath);

[.....]
}

wrapper.c:

void Java_co_uk_ing_simmons_aberdeensoundsites_Record_initEncoder(JNIEnv *env,
        jobject jobj, jint in_num_channels, jint in_samplerate, jint in_brate,
        jint in_mode, jint in_quality) {
[....]

Full log cat error:

04-17 20:58:36.009: E/AndroidRuntime(26768): FATAL EXCEPTION: main
04-17 20:58:36.009: E/AndroidRuntime(26768): java.lang.UnsatisfiedLinkError: initEncoder
04-17 20:58:36.009: E/AndroidRuntime(26768):    at co.uk.ing_simmons.aberdeensoundsites.Record.initEncoder(Native Method)
04-17 20:58:36.009: E/AndroidRuntime(26768):    at co.uk.ing_simmons.aberdeensoundsites.Record.onCreate(Record.java:79)
04-17 20:58:36.009: E/AndroidRuntime(26768