cs.collections error

[DaveG]

Hi
I have this error from the python 2.7 code below. Can someone help please? Much appreciated.

Error:
Traceback (most recent call last):
  File "C:/Users/David/PycharmProjects/pythonProject2/venv/init_collapse.py", line 107, in <module>
    csp=cs.collections[0].get_paths()[2]# path
IndexError: list index out of range

################################################## collapse bathymetry data
collapse_steps=2 # can be changed by USER
collapse_starttime=0.0 # in second; can be changed by USER
collapse_times=linspace(0,collapse_duration,collapse_steps)
cs=contour(kxx,kyy,-kelevation,[collapse_depth])
csp=cs.collections[0].get_paths()[2]# path
csv=csp.vertices # vertices
csv_x=csv[:,0]
csv_y=csv[:,1]
if (not plot_debugfig):
    close()