npostavs@users.sourceforge.net writes:

> Live System User <nyc4bos@aol.com> writes:
>
>>     What is the cause of the "stringp" error and why doesn't
>>     "debug-on-error" give further diagnostics on its cause?
>>     The " *server*" buffer logging information appears to show
>>     the correct passing of the protocol parameters so what is
>>     the argument(s) that the Emacs server belives is nil or
>>     missing?
>
> The error happens inside a condition-case, so the debugger is not
> invoked.  Can you try setting debug-on-signal?

  Here is the backtrace, as an attachment.

  Thanks.