Emacs: error wrong number of arguments when trying to call my function

Question

I'm trying to make a function that moves to the end of line and inserts a newline.

(defun newline-below ()
    (interactive)
    (move-end-of-line)
    (newline)
)

However, I get a cryptic error when I try to run it.

newline-below: Wrong number of arguments: #[(arg) "

choroba · Accepted Answer · 2012-03-06 08:57:02Z

12

The function move-end-of-line needs an argument (try C-hf while the cursor is over the function). Just nil might work for your purpose:

(move-end-of-line nil)

answered Mar 6, 2012 at 8:57

choroba

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2 Comments

phils Over a year ago

Handy trick: M-x toggle-debug-on-error. Now run your function, and you'll get a stack trace showing exactly where the error is coming from. See M-: (info "(elisp) Debugger") for details of how to use the debugger.

sabof Over a year ago

One more handy trick: M-x eldoc-mode - when your point is inside a function you can see the required and optional arguments

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