Problem with speedtest-netperf.sh

Installing and Using OpenWrt
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I am getting "WARNING: netperf returned errors. Results may be inaccurate" when I try running speedtest-netperf.sh. If I ssh into my friend's system, I can run the script using the same switches and it does not end in errors. How can I debug?

speedtest-netperf.sh -p 1.1.1.1 --sequential -t 30
2020-11-24 14:02:16 Starting speedtest for 30 seconds per transfer session.
Measure speed to netperf.bufferbloat.net (IPv4) while pinging 1.1.1.1.
Download and upload sessions are sequential, each with 5 simultaneous streams.
..................................................................................................................................
WARNING: netperf returned errors. Results may be inaccurate!

 Download:   0.00 Mbps
  Latency: [in msec, 97 pings, 0.00% packet loss]
      Min:  22.600
    10pct:  23.300
   Median:  24.500
      Avg:  24.956
    90pct:  26.000
      Max:  33.000
  netperf:   0.3
..................................................................................................................................
WARNING: netperf returned errors. Results may be inaccurate!

   Upload:   0.00 Mbps
  Latency: [in msec, 102 pings, 0.00% packet loss]
      Min:  22.500
    10pct:  23.400
   Median:  24.300
      Avg:  24.550
    90pct:  25.500
      Max:  31.700
  netperf:   0.3
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