problem with snippets

Hi,
In Ultisnips, I have a snippet:
snippet prg
!This is file : `!v expand('%:t:r')`
! Author= `!v expand($USER)`
! Started at: `date +%d.%m.%y`
! Last Modified : Wed 17 Jun 2015 04:09:27 PM BST
!
Program ${1:<++`!v expand('%:t:r')`}
Implicit None
${2:<++Start Typing++>}
End Program ${1/([^\n$]+).*/$1/}
endsnippet


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
<++> !****<= Dont know why this <++> and 0 is coming
0
End Program i

So, Though this is called properly, I am getting few crap line. Can you kindly help me?

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