Install TurtleBot3 Packages

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Hi.

I followed the instruction below.

link text

However, I got errors when I installed TurtleBot3 Packages on my remote PC.

shunta@shunta-MacBookAir:~/turtlebot3_ws$ vcs import src < turtlebot3.repos
EEEEE  
=== src/turtlebot3/turtlebot3 (git) ===    
Invocation of command 'import' on client 'git' failed: AssertionError: Could not find 'git' executable (/usr/lib/python3/dist-packages/vcstool/clients/git.py:531)  
=== src/turtlebot3/turtlebot3_msgs (git) ===  
Invocation of command 'import' on client 'git' failed: AssertionError: Could not find 'git' executable (/usr/lib/python3/dist-packages/vcstool/clients/git.py:531)  
=== src/turtlebot3/turtlebot3_simulations (git) ===  
Invocation of command 'import' on client 'git' failed: AssertionError: Could not find 'git' executable (/usr/lib/python3/dist-packages/vcstool/clients/git.py:531)   
=== src/utils/DynamixelSDK (git) ===  
Invocation of command 'import' on client 'git' failed: AssertionError: Could not find 'git' executable (/usr/lib/python3/dist-packages/vcstool/clients/git.py:531)  
=== src/utils/hls_lfcd_lds_driver (git) ===  
Invocation of command 'import' on client 'git' failed: AssertionError: Could not find 'git' executable (/usr/lib/python3/dist-packages/vcstool/clients/git.py:531)

Do you know how to solve these problems?