[CUDA] Multiplication of two Arbitrarily Sized Matrices

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Multiplying two Matrices A[4x3] and B[3x4].
Resultant Matrix C[4x4].

no of parallel operations per block is 4.
Therefore,
THREADS_PER_BLOCK = 4

dim3 dimBlock(THREADS_PER_BLOCK, THREADS_PER_BLOCK);
dim3 dimGrid(B.width/dimBlock.x, A.height/dimBlock.y);
MatrixMultKernel<<<dimGrid, dimBlock>>>(d_A, d_B, d_C);

CUDA reports "invalid configuration error". need help in this regard.