Manually editing the Android project’s .classpath file

Question

it seems like I can't resolve this java.lang.NoClassDefFoundError: com.urbanairship.UAirship that i posted here. I've been trying every possible ways that i found online but no luck.. However, I found another way that i want to try but i do not know how to do that because i 'm new to android.

Could someone direct me how to do this kindly?

manually editing the Android project’s .classpath file with exported=”true”

ps: if anyone knows how to fix the NoClassDefFoundError at Runtime, please let me know. Thank you

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.app.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
        android:name="com.app.android.NotifyMeApplication"
        android:debuggable="true"
        android:allowClearUserData="true"
        android:enabled="true" >