Question: Matrixplot error

Hi experts, I used matrixplot for plotting B[n,m]. In B[n,m] I saved n->17 and m->17 values (so 17*17)...... when I use matrixplot(B,.....) I get the following error message: Error, (in plots/matrixplot) invalid input: `convert/Matrix` expects its 1st argument, M, to be of type {Matrix, Vector, Array, array, list}, but received B thanks a lot for your help!
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