I Switched platforms and I got this errors

These errors show up when switch from Stand Alone platform to Adnroid.

sorry if I’m asking quite noob. Because I only have a percent of knowledge about unity 3D.

You have to declare the types of your variables explicitly. Meaning that you have to give the type of each variable instead of leaving it to the compiler to decide.

var someVariable;       // Bad
var someVariable : int; // Good

Just put a

#pragma strict

At the top of your Unityscript and it will warn you when you do dynamic typing on compile time instead of runtime.