Error:(35, 24) java: no suitable method found for registerMessage(java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData>,java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData>,int,cpw.mods.fml.relauncher.Side)
    method cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.<REQ,REPLY>registerMessage(java.lang.Class<? extends cpw.mods.fml.common.network.simpleimpl.IMessageHandler<REQ,REPLY>>,java.lang.Class<REQ>,int,cpw.mods.fml.relauncher.Side) is not applicable
      (argument mismatch; java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData> cannot be converted to java.lang.Class<? extends cpw.mods.fml.common.network.simpleimpl.IMessageHandler<org.halvors.electrometrics.common.network.PacketRequestData,org.halvors.electrometrics.common.network.PacketRequestData>>)
    method cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.<REQ,REPLY>registerMessage(cpw.mods.fml.common.network.simpleimpl.IMessageHandler<? super REQ,? extends REPLY>,java.lang.Class<REQ>,int,cpw.mods.fml.relauncher.Side) is not applicable
      (argument mismatch; java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData> cannot be converted to cpw.mods.fml.common.network.simpleimpl.IMessageHandler<? super org.halvors.electrometrics.common.network.PacketRequestData,? extends org.halvors.electrometrics.common.network.PacketRequestData>)