"Error using symengine" "Error in sym/subs>mupadsubs" "Error in sym/subs"

2018 7 17
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更新时间：2018 7 17
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"Error using symengine Division by zero."
"Error in sym/subs>mupadsubs (line 160) G = mupadmex('symobj::fullsubs',F.s,X2,Y2);"
"Error in sym/subs (line 145) G = mupadsubs(F,X,Y);"
I'm coding below at the moment and having the error above.
syms x y
f=(-(x - 1)/(x*y))^(1/2)
g=gradient(f,[x,y])
[X,Y]=meshgrid(0:0.01:1,0:1E+7:1E+9);
G1=subs(g(1), [x y], {X,Y});
Anyone knows how to fix this? It'd be great help. I'm losing hours here.

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