The console shows an error, how to fix it?

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Andrey Filimonov2017-10-08 17:39:46

JavaScript

Andrey Filimonov, 2017-10-08 17:39:46

The console shows an error, how to fix it?

Hello
The "Up" button does not work on the page , the console shows an error, please help me understand how to fix it? Copied from here , everything works here.

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Stalker_RED, 2017-10-08
@fil_and

You didn't include jQuery

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