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This is caused by vpp not working properly inside vBRG. There is no deterministic fix for this problem until we have a stable vBRG image. Temporarily, you may try to either restart the vBRG VM or ssh to vBRG and 'systemctl restart vpp' and then retry healthcheck.py. Note that 'systemctl restart vpp' may work better that rebooting the VM but there is no guarantee.
Inside vBRG you can also check the status with 'vppctl show int'. If vpp works properly, you should be able to see that both tap-0 and tap-1 in 'up' state. An example is below.
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