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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: nnimap error reporting
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Jan Rychter <jan@rychter.com> writes:

> nnimap produces strange errors when it can't connect to the server: I
> get a a message "datum not string or error symbol".

Exactly when does it happen?

> Backtrace:
>
> Signaling: (invalid-argument "datum not string or error symbol" nil)
>   signal(invalid-argument ("datum not string or error symbol" nil))
>   cerror(invalid-argument "datum not string or error symbol" nil)
>   apply(cerror invalid-argument ("datum not string or error symbol" nil))
>   error(invalid-argument "datum not string or error symbol" nil)
>   cerror(nil)
>   apply(cerror nil nil)
>   error(nil)
>   mail-source-fetch-imap((imap :server "server.name" :stream ssl :port 993 :user "jwr") #<compiled-function (file orig-file) "...(17)" [orig-file file nnmail-split-incoming nnml-save-mail nil nnmail-get-split-group (imap :server "server.name" :stream ssl :port 993 :user "jwr") nnml-active-number] 7>)

Unfortunately this isn't very useful, perhaps (setq debug-on-signal t)
produces a better backtrace (be prepared to press c sometimes).