MOSS Error : The resource cannot be found

I should have looked for this earlier and saved some time:
Resolve Error : The resource cannot be found

Oh yeah, you also can't comment out @Register directives in the .master page with "<!-- -->" comment blocks. It has to be done with server-side comment blocks: "<%-- --%>". I thought I had commented-out the @Register directives for some missing controls, but turns out I didn't.