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Symmetry mode in Remodel for N-terminal extension

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Symmetry mode in Remodel for N-terminal extension
#1

Hello, 

I am trying to use Remodel for N-terminal extension of my homotetramer. I am passing in a single subunit (chain A) and symmetry file (4 subunits identified) with my blueprint with the extra residues of interest. I am getting the following error: 

File: src/protocols/loops/loops_main.cc:253
[ ERROR ] UtilityExitException
ERROR: Can't build a fold tree from a loop with an unspecified cut point.

From the log, it looks like fragments were successfully created for the N-terminal extension. What should I try to troubleshoot? 

Thank you for your help.  

Post Situation: 
Mon, 2019-11-04 13:41
yvonne.chan2