problem with tank tutorial

in Tank Creation & Control when I put the code this error comes

and I do what they say
87069-problem-2.png
and when I click play I have this problem"All Compiler errors have to be fixed before you can enter play mode"
my unity version is 5.50f3 personal
and link of this phase is

my problem is in this video from 01:00:00 to the 01:02:00

Your code appears to be doing the following:

m_MovementAudio.clip == m_EngineDriving;

== is a comparison, not an assignment operator. switch this with a single = sign and your errors should be solved.

NOTE: to be clear, keep the == on the if condition check, but change to a single = on the lines that are highlighting with the error.