Automatic code to execute only if certain cell is empty

Hi.
Not sure what i'm doing wrong here but excel is sending me an error message. Basically what i'm trying to do is have an automatic code run only if a certain cell is empty, see below ( i made the font red where the code error refers to):

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Try like this:

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That did the trick. Thanks!
Can you give me a brief explanation what the me.range did?
This is new to me.