It seems like this is the issue. I was running pandoc from a mounted exfat 
volume. I'm not getting the issue when I run pandoc outside this volume. 
Apparently this may be a haskell issue when using an exfat volume on macos: 
https://github.com/commercialhaskell/stack/issues/3893. Thanks for the help 
and please let me know if there is a way to avoid this

On Friday, March 10, 2023 at 4:41:42 AM UTC-8 William Lupton wrote:

> I tried this and it worked for me. Same pandoc version (well, 3.1.1) but 
> an older macos version (12.5.1).
>
> This 'resource busy' error reminds of what you get when you try to unmount 
> a volume but have a terminal session with its current directory within the 
> to-be-unmounted volume.
>
> So I wonder whether you could try running it from some other location, 
> just in case there's a problem with creating a temporary file, or something 
> like that.
>
> On Fri, 10 Mar 2023 at 04:25, Elephant <rohit...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>> No, the pdf file does not exist.
>>
>> On Thursday, March 9, 2023 at 7:24:54 PM UTC-8 A A wrote:
>>
>>> Is the Pdf open when you get that error?
>>>
>>> On Thu, 9 Mar 2023, 21:24 Elephant, <rohit...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>>
>>>> Hello,
>>>>
>>>> When I try to to convert form markdown to pdf with weasyprint or 
>>>> wkhtmltopdf, I get the error message `pandoc: openFile: resource busy (file 
>>>> is locked)`.
>>>>
>>>> For example,
>>>>
>>>> > echo "example" | pandoc -o example.pdf --pdf-engine=wkhtmltopdf
>>>> [WARNING] This document format requires a nonempty <title> element.
>>>>   Defaulting to '-' as the title.
>>>>   To specify a title, use 'title' in metadata or --metadata title="...".
>>>> pandoc: openFile: resource busy (file is locked)
>>>>
>>>> and
>>>>
>>>> > echo "example" | pandoc -o example.pdf --pdf-engine=weasyprint
>>>> [WARNING] This document format requires a nonempty <title> element.
>>>>   Defaulting to '-' as the title.
>>>>   To specify a title, use 'title' in metadata or --metadata title="...".
>>>> pandoc: openFile: resource busy (file is locked)
>>>>
>>>> I'm on macos Ventura 13.2.1 and pandoc 3.1. Any idea how to fix this?
>>>>
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>>>>
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>>
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