How to solve Error: Answered with error to command 0xa4: Retrieval of neighboring vehicles needs bitset to specify mode in sumo traffic simulation?

Question

I'm facing the problem in title with sumo 1.2.0. I'm using TRAAS in java and I'm sending the following command to sumo and I don't know how to specify this bitset and it gives me the error Error: Answered with error to command 0xa4: Retrieval of neighboring vehicles needs bitset to specify mode. I have also tried with byte instead of int and it didn't work:

public static SumoCommand getNeighbors(String vehID, int mode) {

        Object[] array = new Object[]{mode};
        return new SumoCommand(Constants.CMD_GET_VEHICLE_VARIABLE, Constants.VAR_NEIGHBORS, vehID, array, Constants.RESPONSE_GET_VEHICLE_VARIABLE, Constants.TYPE_STRINGLIST);

    }

I'm sending the mode as an integer, for example mode=3 which is 101. And also, based on vehicle value retrieve document, I should get the response as String List. But when you check the traci document they receive it as string list of pairs.