need help what is the error here

[wavic]

The 'if' statement must have a code block. Perhaps that 'break' statement? If that is the case, the indentation is wrong.
range() starts with 0. In order to start with 1, for example, add it as a second parameter: range(var, 1).

Do you initialize cube with a value of -64? Also, 'i' in line 9?

cube=-64 # ?
for i in range(abs(cube)+1): 
    if i**3 >=abs(cube):
        break

    if i**3 !=abs(cube):
        print(cube," is not a perfect cube")
    else:
    if  cube<0:
        i = -i # ??

    print('Cube root of ' + str(cube) + ' is ' + str(cube))