Sub Articulo 42.0

 I have just installed yhmath package but when I try to use it I get
 
    !  I can't find file 'yhcmex10.mf'.
 I don't understand it because I have updated the filenames and if I do
   initexmf --find-latex-input yhcmex10.mf
 it returns
   c:\texmf\tex\latex\yhmath\yhcmex10.mf
 So what is the problem.