Latex error "missing \begin{document}"

[Bob Nagler]

When I write a new article I get always the error message at the beginning of the document:
Latex error "missing \begin{document}"
I do not have this problem with old files, although there text contents is similar. Does anybody know how to remedy?
Thanks,
Bob
 

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Bob Nagler
[EMAIL PROTECTED]
Aspirant FWO
Vrije Universiteit Brussel
Department of Applied Physics and Photonics (TW-TONA)
Pleinlaan 2
B-1050 Brussel, Belgium