Week2 Ex 4.2 Error initializing bias to zero (float)

After initializing b to 0.0, I get assertion error as follows
AssertionError Traceback (most recent call last)
in
2 w, b = initialize_with_zeros(dim)
3
----> 4 assert type(b) == float
5 print ("w = " + str(w))
6 print ("b = " + str(b))

AssertionError:

Your initialization of b is correct. Try Kernel → Restart and then run all the cells again.

Resolved, Thanks!