gr_modtool

[sarandis. Doulgeris]

Hello
I am going step by step your 3.2.2 Setting up a new block tutorial
(mutliply_py_ff block) and i get this error:
"" gr_modtool add -t sync -l python
    GNU Radio module name identified: tutorial
    Language: Python
    Enter name of block/code (without module name prefix): mutliply_py_ff
    Block/code identifier: mutliply_py_ff
    /bin/sh: 1: git: not found
    Please specify the copyright holder:  "
What seems to be the problem?