Question: Help with odeplot command and plot also...

Hello everyone. I'm a french student and I make a study on the double pendulum. I have written all of the equations into maple (6 equation for solid movement and 2 for point movement). We will work with 2 equations.

So i got my 2 differential equations (non linear) and I want to odeplot them and after plot the 2 solutions with plot.

Unfortunatly, after reading some post here and solutions, my problem still exist. When I odeplot my solutions : i have a warning message (so also when I plot) :

with(plots):

dsn:=dsolve({E1,E2,ics},{theta[1](t),theta[2](t)},numeric,parameters=[g,l[1],m[1],l[2],m[2]]);

maple answer :  dsn:=proc(x_rkf45) ... end proc

odeplot(dsn,t=0..15);

maple answer : Warning, cannot evaluate the solution past the initial point, problem may be complex, initially singular or improperly set up.

I tried to go by this step by doing this :

C1:=plot(theta[1](t),t=0..15):
C2:=plot(theta[2](t),t=0..15):
display({C1,C2});

maple answer : Warning, unable to evaluate the fonction to numeric values in the region.

So I hope you guys can help me doing my task.

Thanks in advance.

Tranchant Henri