got error of The address should be an int number

[desword]

When I pull the latest the code of this project, and then perform the testing of the example code.
However, I got the error of

The address should be an int number

I clone the project with "LibcSearcher" but not the "libc" as introduced in the readme.

Could you please tell how to fix it? thanks very much!

[desword]

Python 2.7.12 (default, Nov 12 2018, 14:36:49) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from LibcSearcher import *
>>> obj = LibcSearcher("fgets", 0X7ff39014bd90)
The address should be an int number