[Vim-latex-devel] g:Tex_IgnoredWarnings in $VIM/ftplugin/tex.vim produces error message

[Simon Q. <sim...@gm...>]

Hello mailing list!
I put the lines

let g:Tex_IgnoredWarnings.="\nhas changed"
let g:Tex_IgnoreLevel+=1

in the
$VIM/ftplugin/tex.vim
file to suppress some errors connected with certain files I am compiling.

When opening a *.tex file these lines result in error messages in vim:
"C2.4_Moessbauer.tex" 126L, 3472C
Error detected while processing ~/.vim/ftplugin/tex.vim:
line   17:
E121: Undefined variable: g:Tex_IgnoredWarnings
line   18:
E121: Undefined variable: g:Tex_IgnoreLevel

Do you know any way to avoid typing the commands each time when opening a 
*.tex file?

Thanks in advance!
Simon