session problem

Hi,

I have a session problem, I can't find out how to resolve.

This is my session configuration in _vimrc:

set
sessionoptions=blank,buffers,curdir,folds,tabpages,winsize,resize,winpos
map <F12>s :mksession! C:/Progra~1/Vim/vimfiles/sessions/RW.ses <cr>
map <F12>r :source C:/Progra~1/Vim/vimfiles/sessions/RW.ses <cr>

" Updates/make a session
function! UpdateSession()
let b:sessionfile = 'C:/Progra~1/Vim/vimfiles/sessions/RW.ses'
exe "mksession! " . b:sessionfile
endif
endfunction

" Loads a session if it exists
function! LoadSession()
let b:sessionfile = 'C:/Progra~1/Vim/vimfiles/sessions/RW.ses'
exe 'source ' b:sessionfile
endfunction

au VimEnter * :call LoadSession()
au VimLeave * :call UpdateSession()
map <leader>m :call UpdateSession()<CR>

------------------------------------------------------------------------------------

Always the same error when I open GVIM:
Error detected while processing C:/Progra~1/Vim/vimfiles/sessions/
RW.ses:
E163: There is only one file to edit
Press enter or type command to continue

BTW where can I find the message history?
Some errors are passing so quick that I can't read them in time :-)

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