Plotting Error!

[pluto2021]

Some plotting threads are getting the following errors while others are fine. What does this mean? Is it due to hardware or software?

[11428] Failed to execute script chia
Traceback (most recent call last):
File "chia\cmds\chia.py", line 81, in
File "chia\cmds\chia.py", line 77, in main
File "click\core.py", line 829, in call
File "click\core.py", line 782, in main
File "click\core.py", line 1259, in invoke
File "click\core.py", line 1259, in invoke
File "click\core.py", line 1066, in invoke
File "click\core.py", line 610, in invoke
File "click\decorators.py", line 21, in new_func
File "chia\cmds\plots.py", line 135, in create_cmd
File "chia\plotting\create_plots.py", line 158, in create_plots
File "chia\plotting\plot_tools.py", line 110, in add_plot_directory
TypeError: 'NoneType' object is not subscriptable