from control import *import matplotlib.pyplot as plts = tf([1, 0], 1)G = 1/(s*(s+1))fig, ax = plt.subplots(dpi=200)rlocus(G, ax=ax)

---------------------------------------------------------------------------UnboundLocalError                         Traceback (most recent call last)<ipython-input-1-80498c4b1a54> in <module>      6       7 fig, ax = plt.subplots(dpi=200)----> 8 rlocus(G, ax=ax)~\anaconda3\lib\site-packages\control\rlocus.py in root_locus(sys, kvect, xlim, ylim, plotstr, plot, print_gain, grid, ax, **kwargs)    173     174         if print_gain and not sisotool:--> 175             fig.canvas.mpl_connect(    176                 'button_release_event',    177                 partial(_RLClickDispatcher, sys=sys, fig=fig,UnboundLocalError: local variable 'fig' referenced before assignment