[Tutor] BEGINNER - HELP!!!

[Leonard Ujomu]

Help please, 
I just started learning python and I need assistance with the below code: 
def rectangle_area(base,height):    area_a = base*height    print("The area is " + str(area_a))
    rectangle_area(5,6)

I am getting the error below when I run it :Error on line 7: print("The area is " + str(area_a)) ^TabError: inconsistent use of tabs and spaces in indentation
I understand where the error is but I cannot seem to rectify it. Thank you.
Kind Regards, Leonard Ujomu