Facing Problem while appending elements In a list

This thread doesn’t seem to help much since I’ve already done this part

The picture of the error up you posted literary says what’s wrong. There is no function defined in the module with that name that takes 1 argument. That is what the /1 means.
Without extra context (actual code) we cannot help you any further.

In the future please post the text of the errors and not a picture.

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