problems setting up makeprg and makeef

I have setup a vim script to do the following

" Setup the project home directory.
let s:project_path = 'C:\Documents and Settings\user\Projects\myproject\trunk'

" Setup the project home directory such that Vim can understand it. It will
" escape white spaces.
let s:vim_project_path = fnameescape(s:project_path)
" cd to the project directory.
set cd=s:vim_project_path

" Setup make command such that shell can understand it.
" Path to make.exe.
let &makeprg = shellescape(s:project_path.'\tools\make.exe')
" Use makefile from 'src\makefile'.
let &makeprg .= ' -f '.shellescape(s:project_path.'\src\makefile')
" Change to a directory 'src' before running make.
let &makeprg .= ' --directory '.shellescape(s:project_path.'\src')

" Setup the file where the output of ':make' will be redirected.
let &makeef = shellescape(s:project_path.'\src\error.err')

But for some reason whenever I run :make, I'm getting the following error

E40: Can't open errofile :C:/Documents and Settings/user/Projects/myproject/trunk/src/error.err"

I looked at help for E40 but nothing really can explain why this is happening.

Now if my makeef is setup as follows
let &makeef = ""

Then Windows redirects the output to a temporary file and there are no issues. I'd like to be able to store the output in a given file not in a temporary file.

Does anybody know what is the issue and how it can be fixed?

Any help is appreciated.

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