TypeError: cannot unpack non-iterable numpy.float64 object

[A5ad31]

whenever i try to run solution.py with my own input video; video specs: frame (858,482), Data rate and total bitrate is 2044kbps with frame rate 5 frames/second. It gives me the following error.

frame shape (480, 854, 3)
parameters [ 1.2345679 -329.64197531]
(slope, y_intercept) (1.2345679012345703, -329.6419753086435)
parameters [ -1.37837838 799.78378378]
(slope, y_intercept) (-1.3783783783783765, 799.7837837837833)
parameters [ -1.275 753.4 ]
(slope, y_intercept) (-1.275000000000002, 753.4000000000008)
parameters [ 1.33333333 -371.66666667]
(slope, y_intercept) (1.3333333333333333, -371.6666666666665)
left [(-1.3783783783783765, 799.7837837837833), (-1.275000000000002, 753.4000000000008)]
left avg [ -1.32668919 776.59189189]
frame shape (480, 854, 3)
parameters [ 1.32926829 -372.3902439 ]
(slope, y_intercept) (1.3292682926829282, -372.39024390244003)
left []
C:\Users\muhammad.asad\AppData\Local\Continuum\anaconda3\lib\site-packages\numpy\lib\function_base.py:392: RuntimeWarning: Mean of empty slice.
avg = a.mean(axis)
C:\Users\muhammad.asad\AppData\Local\Continuum\anaconda3\lib\site-packages\numpy\core_methods.py:85: RuntimeWarning: invalid value encountered in double_scalars
ret = ret.dtype.type(ret / rcount)
left avg nan
Traceback (most recent call last):
File "solution.py", line 95, in
lines = calculate_lines(frame, hough)
File "solution.py", line 55, in calculate_lines
left_line = calculate_coordinates(frame, left_avg)
File "solution.py", line 60, in calculate_coordinates
slope, intercept = parameters
TypeError: cannot unpack non-iterable numpy.float64 object