I think it is chimera; if you modifie the ef2-denstity from the tutarial and save it as mrc in chimera, it gives the same error. any idea how to fix this?

<t>I try to fit a pdb into a mrc cryo-EM density. Whatever params file I use and whatever pdb (crystal structures, homology model, nicely fittig manual fit, I always get the following error:<br/> PDB Topology .......................... : yeast_dom_xtal.pdb<br/> Current PDB Output ......................