MATLAB error - An error occurred while starting the logging session (error code 6)

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I am trying to run the matlab script below, but I get the error code 6.

m = MokuPhasemeter('192.168.xxx.xxx',true);
%%% Configure instrument to desired state

% start logging session and download file to local directory
m.start_logging('duration',10);

% Track the progress of data logging session
is_logging = true;
while is_logging
    progress = m.logging_progress();
    is_logging = progress.time_to_end > 1;
    pause(1);
end

Full error message:

Error using Requests/parse_response (line 36)
An error occurred while starting the logging session (error code 6)

Error in Requests/http_post (line 128)
            response = obj.parse_response(output, extras);

Error in MokuPhasemeter/start_logging (line 324)
            response = obj.session.http_post(obj.formatString('slot%d/phasemeter/start_logging',
            obj.slot_id), params);

Error in CheckIfLogs (line 5)
m.start_logging('duration',10);