Question: Please help with dsolve

I'm working on a problem for class that requires me to use dsolve but, I'm getting a generic error when I try to use dsolve the exact same way they use it in the example. my code is: A:=matrix([[-1,0],[1,-2]]); B:=matrix(2,1,[1,-1]); ics:=x(0)=matrix(2,1,[1,0]); equ:=diff(x(t),t)=A*x(t)+B; dsolve({equ,ics},{x(t)}); Error, (in solve) invalid arguments I don't know what's wrong with this since its almost exactly like the example they give for dsolve.
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