UnboundLocalError: local variable 'tmp_file' referenced before assignment

[scaleoutsean]

root@ubuntu2004:~# python3 --version
Python 3.8.5

root@ubuntu2004:~# fdisk -l | grep sdb
Disk /dev/sdb: 96 GiB, 103079215104 bytes, 201326592 sectors

root@ubuntu2004:~# mount | grep sdb

root@ubuntu2004:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"

root@ubuntu2004:~# fiosynth -d /dev/sdb -w HE_Flash_Short -c 0.1 -f HE_FlashShort_sd-bcde
Results are in directory: HE_FlashShort_sd-bcde-2020-12-22_11-20
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/fiosynth-3.5.39-py3.8.egg/fiosynth_lib/fiosynth.py", line 468, in createOffsetFile
PermissionError: [Errno 13] Permission denied: '/tmp/offset.txt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/fiosynth-3.5.39-py3.8.egg/fiosynth_lib/fiosynth.py", line 471, in createOffsetFile
UnboundLocalError: local variable 'tmp_file' referenced before assignment

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/fiosynth", line 11, in <module>
    load_entry_point('fiosynth==3.5.39', 'console_scripts', 'fiosynth')()
  File "/usr/local/lib/python3.8/dist-packages/fiosynth-3.5.39-py3.8.egg/fiosynth_lib/fiosynth.py", line 747, in main
  File "/usr/local/lib/python3.8/dist-packages/fiosynth-3.5.39-py3.8.egg/fiosynth_lib/fiosynth.py", line 732, in runSuite
  File "/usr/local/lib/python3.8/dist-packages/fiosynth-3.5.39-py3.8.egg/fiosynth_lib/fiosynth.py", line 474, in createOffsetFile
UnboundLocalError: local variable 'tmp_file' referenced before assignment