Connection refused error when starting P4 studio runtime environment in Tofino hardware

I am using a Wedge100BF-32X programmable switch and trying to setup Intel P4 studio SDE in this switch to run P4 programs. When I try to run a P4 example program

tna_resubmit

with P4 studio SDE using the following command,

root@localhost:~/bf-sde-9.9.0# ./run_switchd.sh --arch tofino -p tna_resubmit

I am getting the following error:

connect failed. Error: Connection refused 

The full output from the command is here.

Environment:

P4 studio SDE version: 9.9.0
uname  -r: 4.14.151-OpenNetworkLinux
cat /etc/onl/platform: x86-64-accton-wedge100bf-32x-r0
ls /dev/bf0: /dev/bf0
lsmod:
Module                  Size  Used by
bf_kdrv                24576  0
pmbus                  16384  0
pmbus_core             28672  1 pmbus
x86_pkg_temp_thermal    16384  0
gpio_ich               16384  0
optoe                  20480  0

A user on Github suggested reloading kernel driver and checking if

/dev/bf0

exists. I did them both, but the issue remains. Any help would be appreciated.