problem in vim snippets

I am using templates for expanding few text, eg.

!File=[:EVAL:]expand('%')[:END:]
!Author=
!Created=[:EVAL:]strftime('%c')[:END:]
!Last Modified=[:EVAL:]strftime('%c')[:END:]
Program [:EVAL:]expand('%:t:r')[:END:]
Implicit None
<++>
End Program [:EVAL:]expand('%:t:r')[:END:]


And I am calling this as:

"let s:plugin_dir = $HOME.'/.vim/bundle/vimf90/'
let s:plugin_dir=filter(split(&rtp, ','), 'v:val =~ "/vimf90"')[0]
let s:templatedir=s:plugin_dir . '/templates/'
function! Prog(arg)
execute 'r ' . s:templatedir . a:arg . '.txt'
%substitute#\[:EVAL:\]\(.\{-\}\)\[:END:\]#\=eval(submatch(1))#ge
endfunction


So, I am expecting to have the snippet called. But what I am getting is:

!****<= A blank line at top
!File=i.f90
!Author=
!Created=Wed 04 Nov 2015 10:54:29 CET
!Last Modified=Wed 04 Nov 2015 10:54:29 CET
Program i
Implicit None
<++>
0 !****<= Dont know why this "0" is coming
End Program i
So, Though this is called properly, I am getting few crap line. Can you kindly help me cleaning them?

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