Raphael JS, Path animation

I have a path:

var original_param = 'M '+p1.x+' '+p1.y+'L '+p2.x+' '+p2.y;
var pa开发者_开发知识库th = paper.path(original_param);

I have defined another path attribute for animation:

var animation_param={M: p11.x+' '+p11.y, L: p22.x+' '+p22.y}

where p1 and p2 are points, I do not put their definitions here, since they return the proper values correctly here.

Then I animate the path with the parameters by:

path.animate(animation_param, 1000);

But I got error message

What is the reason of this error?

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Did you try use animation_param as string except object? I think it should work.