"someone directly edited the html output" substitution

I have several pages with this error in "Component Errors":

"Someone directly edited the HTML output of a FrontPage Substitution
component; the changes have been overwritten."

Every time I try to open an HTML file for editing, it displays this message:
"The contents of a FrontPage component have been modified. These contents
will be overwritten when you save this page."

These messages will not go away. What did I do and how do I fix it now?
Driver [ Do, 24 April 2008 05:08 ] [ ID #1949205 ]
Microsoft » microsoft.public.frontpage.client » "someone directly edited the html output" substitution

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