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Question: Error in DEplot the 'number' option must be specified before initial conditions

Question:Error in DEplot the 'number' option must be specified before initial conditions

ktreading 0 Maple
January 27 2013
0

I'm trying to plot this equation with initial conditions. I'm following the exact same code that my professor used, but it isn't working. 

 

restart; with(plots): with(DEtools):

DE := y(t)^2*(4-y(t)^2);

p1 := DEplot( DE, y(t), t=0..1/2, {[y(0)=1],[y(0)=3]}, arrows=none, thickness=2, linecolor=[blue,green]):

 

Under the last line of code I get the error "Error, (in DEtools/DEplot/CheckInitial) the 'number' option must be specified before initial conditions" but I can't figure out what I'm doing wrong.
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