Problem with python code and cvxopt

[Ha Thanh Minh]

I am learning branch-and-bound methods from this course: https://stanford.edu/class/ee364b/lectures.html
and running the python file (bb30.py) utilizing python 3.5. However, I face with one problem which, I guess, is at the following commands:

min_mat = matrix(0, (n,n), tc='d')
min_mat[range(0, n**2, n+1)] = matrix(mins)

max_mat = matrix(0, (n,n), tc='d')
max_mat[range(0, n**2, n+1)] = matrix(maxes)


The error is that:

min_mat[range(0, n**2, n+1)] = matrix(mins)

TypeError: invalid index arguments

Could you please help me fix this problem?
Thank you very much!