Detect Lane has no attribute 'left_fit'

[lucyivt]

Hi, I've been trying to get the lane detection code to work but keep getting this error:

AttributeError: 'DetectLane' object has no attribute 'left_fit'

The problem arises in line number 159 of detect_lane.py:
if yellow_fraction > 3000:
self.left_fitx, self.left_fit = self.fit_from_lines(self.left_fit , cv_yellow_lane)
self.mov_avg_left = np.append(self.mov_avg_left,np.array([self.left_fit]), axis=0)

Where we try to initiate self.left_fit while also using it in the function parameter. I've been struggling to figure out how to fix this problem, I've tried to initiate self.left_fit before this line (making it an array) but more errors occur. (I put the turtlebot between the yellow and white lines.) Any help would be greatly appreciated!

EDIT:
Posted this in the wrong git repo, I'm using noetic!