"Validates resource references inside Android XML files"

It looks like your ManageApps activity is not in the package name space:

<activity
    android:name="ManageApps"
    android:label="@string/app_name">
    <intent-filter>
        <action android:name="net.web44.jimappdev.thecoincollector.manageapps" />

        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

The name must start with a . to be considered part of the package name space:

    android:name=".ManageApps"

Also, even though I'm not 100% sure, I always assumed that action names were case sensitive. In the manifest section above, you use manageapps for the last part of the action name, while you use it in mixed case when building the intent in the Java code:

startActivity(new Intent("net.web44.jimappdev.thecoincollector.ManageApps"));