ERROR Matrix_Multiply only allowed for nxm by lxn matrices second matrix must have same number of colums as first matrix has number of rows

Facing square matrix error in the calc_J version 1.9.
The system contains 74 atoms and I'm using the basis set B3LYP-GD3/6-311G++(d,p). I got 1126 MOs for both the monomers and the dimer contains 2243 MOs.

Start by reproducing the calc_J version 1.9 failure with the reported 74-atom system, B3LYP-GD3/6-311G++(d,p) basis, and monomer/dimer MO counts. Trace where the Matrix_Multiply dimension error is raised and identify which matrix dimensions are inconsistent; done means the reported calculation completes without that error.

Written by the indexing model from the issue text.