Taylor Series Reversion error: 'quotient' by 'zero'

I'm new to Maxima and Computer Algebra Systems in general. So far Maxima
seems to be exactly what I need right now.

As part of a side project I'm trying to find the inverse of a function. It
has no closed-form function, at least in the general case, so I'm
approximating it with a Taylor series. Note that the series has
coefficients of 0 for the 0th, 1st, and 2nd terms. When I try to do a
reversion of series using the `revert` command, it fails and gives the
error: "'quotient' by 'zero'" (see below). How do I resolve this? Once upon
a time, I used Mathematica to find the inverse of a very similar series and
it worked fine. How do I do this with Maxmia?

(%i1) eq: (2*t-sin(2*t))/%pi;
eq (2*t-sin(2*t))/%pi
(%i9) ser: taylor(eq,t,0,9);
ser
(4*t^3)/(3*%pi)-(4*t^5)/(15*%pi)+(8*t^7)/(315*%pi)-(4*t^9)/(2835*%pi)+...
(%i10) revert(ser,t);
(%o10)
revert(-((4*t^9)/(2835*%pi))+(8*t^7)/(315*%pi)-(4*t^5)/(15*%pi)+(4*t^3)/(3*%pi),t)
(%i11) load("revert")$
(%i61) revert(ser,t);
`quotient' by `zero'

 -- an error. To debug this try: debugmode(true);


Thanks in advance,

-- 
Justin

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