This happens when updating to the latest version of MiKTeX. Assuming that you are including the “nomencl” package, then you need to do the following substitutions:
- Replace \makeglossary with \makenomenclature
- Replace \printglossary with \printnomenclature
The nomencl package is useful for producing nomenclatures/glossaries. For more information check the nomencl package documentation @ the University of Cambridge [this is a pdf file].