An issue occurred in constructing observation_space in human mode.

[TejaswiniMedi]

It appears that the x and y axes have been swapped while constructing observation_space, so are required to be set correctly in 'ofp-v0'.
Here is the corrected version:
observation_low = np.zeros(4 self.n)
observation_high = np.zeros(4 self.n)
observation_low[0::4] = 0 + self.w / 2
observation_low[1::4] = 0 + self.l / 2
observation_low[2::4] = self.min_width
observation_low[3::4] = self.min_length
observation_high[0::4] = self.W - self.w / 2
observation_high[1::4] = self.L - self.l / 2
observation_high[2::4] = max(self.w)
observation_high[3::4] = max(self.l)**