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Question: Maple 18 does not show phaseportrait, neither slops

Question:Maple 18 does not show phaseportrait, neither slops

Alnix 5 Maple 18
phaseportrait
January 17 2015
1

ok so I run Maple 18 , but the problem is that maple does not show me the phase portrait , it only keep showing me what i write,

for example , i write this  

  DE1 := diff(y(t),t) = z(t);
  DE2 := diff(z(t),t) = -y(t)*cos(t);
  phaseportrait([DE1,DE2],[y,z],t=-5..5,[[y(0)=1,z(0)=0],[y(0)=0,z(0)=2],[y(0)=0,z(0)=-2]],y=-Pi..Pi,z=-3..3,color=aquamarine,linecolor=blue);
  
and maple just show me these back 
what should i do?

 
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