# Problem With Fonts

I am submitting a paper at CIKM. So I have downloaded the sig-alternate.cls and sig-alternate.tex files. But problem is that while compiling them the following errors are coming:

******LaTeX Font Warning: Font shape T1/aett/bx/n' undefined
(Font)              using T1/aett/m/n' instead on input line 414.**
...
LaTeX Font Warning: Some font shapes were not available, defaults substituted.****


I am not getting any clue to fix the error.

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Welcome to TeX.SX! You may have a look on our starter guide. –  texenthusiast May 24 '13 at 4:28
Possible duplicate/work-around: Typewriter text in sections with ACM sig-alternate document class –  Werner May 24 '13 at 4:47

The warning says that the font T1/aett/bx/n (font ae monospaced bold) was unavailable (it doesn't exist) and that instead LaTeX used font T1/aett/m/n (font ae monospaced). The ae fonts are based on the default Computer Modern fonts, where the monospaced version has no bold; these fonts are loaded by default by the sig-alternate class.