how to install simplechat

[DarshanaPatinge]

https://stackoverflow.com/questions/47216714/how-cofigure-simple-chat-widget-in-yii2 here is the link of the same problem which i have
I am following the instruction as given in github . but when I run given "yii simplechat" I got the error. how solve it where I am going wrong

[khikmatullaev]

Really, I can't run:

show available commands

php yii simplechat

create test tables, generates and load fixtures

php yii simplechat/start

unload fixtures

php yii simplechat/clean

unload fixtures and load them again

php yii simplechat/reset

unload fixtures and drop test tables

php yii simplechat/stop

It doesn't work. What is the solution?