# How do I fix a Corrupted NFSS tables

I'm getting this error. From poking around I think it might be due to a missing language file, but I don't know how to find out which.

LaTeX Font Warning: Font shape TS1/aett/m/n' undefined
(Font)              for symbol textquotesingle' on input line 55.

("C:\Program Files (x86)\MiKTeX 2.8\tex\latex\base\ts1cmr.fd")
! Corrupted NFSS tables.
wrong@fontshape ...message {Corrupted NFSS tables}
error@fontshape else let f...
l.56 ...oxbacktick=\hbox{\begin{normalsize}\verb.
.\end{normalsize}}%

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You seem to be using the ae package. Don't: it's obsolete. Install the CM-Super fonts or say \usepackage{lmodern}. –  egreg Nov 15 '11 at 6:42
Try and show a minimal example reproducing the error. –  egreg Nov 15 '11 at 8:26