Hi Armin,
This problem turns out to be kind of complicated to fix, but rather easy to work around.  Until I have time to actually fix the problem you can work around the problem by running this command (Favorites->Command Line) after opening 1u54 and before doing the modeling:  setattr r isHet false :ptr
I will open a ticket in our bug database for this issue with you on the recipient list, so you will know when it is actually fixed.

—Eric

On Jan 29, 2018, at 1:49 PM, ARMIN HODAEI <ahodaei15@ku.edu.tr> wrote:

Dear Chimera Users,

     I am trying to add missing residues to the protein with the ID: 1u54
But unfortunately for chain A, I cannot do the adding.

   I go to "Tools > Structure Editing > Model/Refine Loops". Then I choose "chain A" and I select "all missing structure" and then "apply". But I got an error. Is there any other way for it? for "chain B" it works.

Best Wishes,
Armin
--
Armin Hodaei
Department of Physics,
Faculty of Arts and Sciences
Koc University, Istanbul
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