namespace could not be found

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Hello everybody !

I would like to use CrossPlatformInput in the standart assets to use a virtual joystick to make a Android game, but when i put in the script the
"if (view.isMine)
{ ......
} "

I have a error message who said ; namespace PhotonView could not be found

I add the variable : PhotonView view;

and in the start metod i add :
"{
view = GetComponent();
}"

Someone know what is happening?