ode45 integration tolerances

I am getting a warning 'Warning: Failure at t=5.672199e-11. Unable to meet integration tolerances without reducing the step size below the smallest value allowed

(1.033976e-25) at time t.

> In ode45 (line 360) '

As a result of this warning message I am getting my graph missing. the last part of my graphic is missing. How can I fix this problem. Here I am adding the related part of my code.

options = odeset('RelTol',1e-1,'AbsTol',1e-10);

[tt,N]=ode45('Fd3gainsw',tt,NNo,options);

tt=3000x1 double

NNo=5x1

[Ameer Hamza]

This is likely caused by a singularity in the ODEs. Can you show the equations?

[hilal duran]

yes.

fes=1-(N(2)/(4*N0));

fgs=1-(N(3)/(2*N0));

twe=1./(Aw+Cw*N(1));%6.3e-12;

teg=1./(Ae+Ce*N(1));%2.9e-12;

twg=twe;

tge=(1/2)*teg*exp(Eeg/KbTev);%10.4e-12;

tew=(4/10)*twe*exp(Ewe/KbTev);%2.7e-9;

OP=(p*rl)/(0.84*q);

z(1)=I/(q*Va)-fes*(N(1)/twe)-fgs*(N(1)/twg)-N(1)/twr+N(2)/tew;

z(2)=fes*(N(1)/twe)+fes*(N(3)/tge)-fgs*(N(2)/teg)-N(2)/tew-N(2)/ter-ge*(0.5*N(2)-N0)*N(4)/(1+ep*N(4))...;

+ge*(0.5*N(2)-N0)*N(4)*OP/(1+ep*N(4));

z(3)=fgs*(N(1)/twg)+fgs*(N(2)/teg)-fes*(N(3)/tge)-N(3)/tr-g*(N(3)-N0)*N(5)/(1+ep*N(5));

z(4)=ge*(0.5*N(2)-N0)*N(4)/(1+ep*N(4))+gam*bet*N(2)/ter-N(4)/tp;

z(5)=g*(N(3)-N0)*N(5)/(1+ep*N(5))+gam*bet*N(3)/tr-N(5)/tp;