Error when trying to Attach To (Lightroom) Process in WinDBG

Many of us find it easier to log debug output to a file in the plugin folder. Then you can view it with your favorite editor, search it with "grep", users can send you debug logs, etc.  Here's how I use LrLogger to do that:

--[[----------------------------------------------------------------------------
public LrLogger log


The "log" is an LrLogger log file that by default writes to the file "debug.log"
in the current plugin directory.
------------------------------------------------------------------------------]]

local log = LrLogger (_PLUGIN.id)
    --[[ This apparently must be unique across all of Lightroom and plugins.]]


local logFilename = LrPathUtils.child (_PLUGIN.path, "debug.log")


log:enable (function (msg)
    local f = io.open (logFilename, "a")
    if f == nil then return end
    f:write (
        LrDate.timeToUserFormat (LrDate.currentTime (), "%y/%m/%d %H:%M:%S"),
        msg, Newline)
    f:close ()
    end)