Reported error: "operator +: nonconformant arguments (op1 is 1x8, op2 is 1x4)"

Hi,
I’m new here. I use Octave 9.2 and Dynare 6.2. I installed the MMB program and tried to start it. However, when I run a model, an error appears. Unfortunately, I don’t know how to fix it. I would be really grateful if someone could help me.
Thank you for your attention.