[GiNaC-list] dirac_slash(0) Does'nt work !!!

[J. gallardo]

I'm trying to write an expression wich uses a Dirac " gamma 0 " for
calculations on spin polarization projector, the line looks like:

ex XAA=dirac_slash(0)* dirac_slash(k,4)*proj1* dirac_slash(E,4)*
(dirac_slash(p,4)+ m * dirac_ONE()) * dirac_slash(E,4) *
dirac_slash(k,4)*proj1* dirac_slash(E1,4) * (dirac_slash(p1,4)+m *
dirac_ONE());

i'm not surethis is right, but I can't find other way to put a "gamma 0"  in
the expression...
For instance I get the error:

/usr/local/include/ginac/clifford.h: In function ‘int main()’:
/usr/local/include/ginac/clifford.h:231: error: too few arguments to
function ‘GiNaC::ex GiNaC::dirac_slash(const GiNaC::ex&, const GiNaC::ex&,
unsigned char)’
QED_slasshes.cc:80: error: at this point in file

what is wrong ?
How I have to do it?

Thanks.

Jorge.
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