Runtime error

[spy14414]

I ran this code but something went wrong:
File "D:\python\track\optical_flow\estimateFeatureTranslation.py", line 88, in estimateFeatureTranslation
solution=inv(A).dot(b)
File "D:\Anaconda2\envs\orangeP\lib\site-packages\numpy\linalg\linalg.py", line 551, in inv
ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)
File "D:\Anaconda2\envs\orangeP\lib\site-packages\numpy\linalg\linalg.py", line 97, in _raise_linalgerror_singular
raise LinAlgError("Singular matrix")
How to solve this problem？
Can you help me?
Thanks in advance.

[spy14414]

By the way,I am using a uvc camera to grab pictures.