After .cls file changes, \includegraphics[scale=0.5]{img/GoalHierarchyMetaModel.png} command gives the following error.

! Package keyval Error: scale=0.5 undefined.

See the keyval package documentation for explanation.
Type  H <return>  for immediate help.

l.6 ...[scale=0.5]{img/GoalHierarchyMetaModel.png}

MWE can be accessed from google drive in here.

main_e.tex is the working one, main_m.tex outputs error above. Only difference between those files is documentclass.

  • main_e.tex uses \documentclass[conference]{IEEEtran}
  • main_m.tex uses \documentclass[chaparabic,ceng,phd,12pt,oneandhalf]{metu}
  • Let me guess: you have \usepackage[turkish]{babel}. – egreg Apr 22 '14 at 19:20
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    Possibly the first class loads graphicx while the second loads graphics. I recommend you explicitly load graphicx if you want to include image files. – Nicola Talbot Apr 22 '14 at 19:22
  • If you're using babel for Turkish, look at tex.stackexchange.com/questions/32178/… – egreg Apr 22 '14 at 19:26
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    @Speravir: But the latter does not contain the alternative solution of egreg via xkeyval. Thus some merging should be done. – Heiko Oberdiek Apr 22 '14 at 21:36
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    @HeikoOberdiek: Or even better: \newgeometry doesn't work with Turkish babel package, because it does contain much more solution ways. – Heiko Oberdiek Apr 22 '14 at 21:39

As egreg guessed your class has \RequirePackage[english,turkish]{babel} which apparently redefines = you need to locally set it back:


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