General ⇒ error from \input{} but not from same code in main file

[kaneofawesome]

Hello,

I'm having a problem with the \include and \input commands. I have something like...

\include{file1}
\include{file2}
\include{file3}

where file2 has only the following...

\section{Background}
some text
\subsection{something}
some text
\subsubsection{something}
some text
\subsection{something}
some text

And I get errors saying "1.21 missing $ inserted."

If I cut the contents of file2 and paste them in the main document, these compile errors don't show up. I'm not changing them at all. The \input{file2} still has the compile errors. Has anyone else had this problem?

[kaneofawesome]

found the problem...
my filenames had underscores in them. That's why latex gave me "missing $" errors.

[localghost]

found the problem […]

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Best regards and welcome to the board
Thorsten