LISP allocation error

I got this error, and I have no idea how i can use Allocate or what this means.

Maxima encountered a Lisp error:
Error in PROGN [or a callee]: The storage for BIGNUM is exhausted.
Currently, 5630 pages are allocated.
Use ALLOCATE to expand the space.
Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.

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here my code:

eqe3: J=xp^2*mp+xw^2*mw+xb^2*mb+(-xp^3/3+xb^3/3)*A*roh;
eqe4:xw*mw+mb*xb+mp*xp+(-xp^2/2+xb^2/2)*A*roh=0;
eqe5:xcogw=(xw*mw+xb*mb+(-xp^2/2+xb^2/2)*A*roh)/(mw+mb+mt);
eqe6:mw=(-xpo+xp+xb-xbo)*A*roh+mwo;
solve([eqe3,eqe4,eqe5,eqe6],[mw,xw,xp,xb]);

I am using wxMaxima 0.8.7 on win7 32 bit

How can I fix this?