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Question about ArrayFlatten

The coding below is not working. I don't know what is wrong.
Please give me some advice.

m1 = ConstantArray[0, {2 Length[genindex], 2 Length[genindex]}];
m2 =  ConstantArray[0, {Length[genindex], 2 Length[genindex]}];
m3 =  ConstantArray[0, {Length[genindex], Length[genindex]}];
m4 = IdentityMatrix[Length[genindex]];

Au1 = ArrayFlatten[{{m1}, {m2}, {m3, m4}}];

Thank you.

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