Error while running pyinknife_plot

[Comp-era]

I am getting error while running pyinknife_plot, below is the log for the same,

command - mkdir plots
pyinknife_plot -c /home/skhatri/PyInKnife2/PyInKnife/config/run.yaml -ca /home/skhatri/PyInKnife2/PyInKnife/config/aggregate.yaml -cp /home/skhatri/PyInKnife2/PyInKnife/config/plot_hubs_barplot.yaml -p hubs -d aggregate -od plots

Error -
INFO:PyInKnife.pyinknife_plot:The directory '/home/skhatri/pyinknife/plots' was found.
Traceback (most recent call last):
File "/home/skhatri/anaconda3/envs/pyinteraph/bin/pyinknife_plot", line 33, in
sys.exit(load_entry_point('PyInKnife==2.0.0', 'console_scripts', 'pyinknife_plot')())
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/PyInKnife-2.0.0-py3.9.egg/PyInKnife/pyinknife_plot.py", line 328, in main
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/cbook/deprecation.py", line 451, in wrapper
return func(*args, **kwargs)
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/pyplot.py", line 1287, in subplots
fig = figure(**fig_kw)
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/pyplot.py", line 687, in figure
figManager = new_figure_manager(num, figsize=figsize,
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/pyplot.py", line 315, in new_figure_manager
return _backend_mod.new_figure_manager(*args, **kwargs)
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 3494, in new_figure_manager
return cls.new_figure_manager_given_figure(num, fig)
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/site-packages/matplotlib/backends/_backend_tk.py", line 885, in new_figure_manager_given_figure
window = tk.Tk(className="matplotlib")
File "/home/skhatri/anaconda3/envs/pyinteraph/lib/python3.9/tkinter/init.py", line 2270, in init
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "localhost:21.0"

Kindly help in this regard!
Thanks