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    java.lang.NullPointerException
        at com.cloud.network.NetworkManagerImpl.allocate(NetworkManagerImpl.java:1535)
        at com.cloud.utils.db.DatabaseCallback.intercept(DatabaseCallback.java:30)
        at com.cloud.vm.VirtualMachineManagerImpl.allocate(VirtualMachineManagerImpl.java:280)
        at com.cloud.utils.db.DatabaseCallback.intercept(DatabaseCallback.java:30)
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