Oh, and I don't face this problem when I use 'loadSequencesFromPdb' to load sequence.

Hi Firstly, I must commend the team on the fantastic tutorial. It is clear, to the point and covers possible errors and solutions. I am trying to use MMB to model DNA sequences with certain base interactions (baseInteraction B 2 WatsonCrick B 6 WatsonCrick Cis). However, I am running into this error...