Too many math alphabets used in version normal

[Masoud Salehi]

Hi,

I am writing a book and use a variety of fonts in it. When latexing I get
the error message

! Latex Error: Too many math alphabets used in version normal.

If I delete some fonts the document is compiled with no error. I was
wondering if there is a way I can increase the font handling capacity of
LateX. My version of Y&Y is 2.2.3

Thanks