Multiverse Core not found

Can someone take a look at this and tell me why it might not be confirming the multiverse plugin as an instance of multiverse. I can't figure it out

private void loadMultiverseCore() {
    Plugin multiversePlugin = getServer().getPluginManager().getPlugin("Multiverse-Core");
    if (multiversePlugin instanceof MultiverseCore) {
        MVWorldManager = ((MultiverseCore) multiversePlugin).getMVWorldManager();
    } else {
        throw new RuntimeException("Multiverse-Core not found!");
    }
}


I have the 4.3.1 API and MultiverseCore-4.3.1 installed and running on my server yet it still tells me it's not found. Not sure what it is
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