Hi,
I think the MAXCHN "errors" has been "fixed" in recent versions of CNS.
You must be using CNS v1.0 or v1.1.
So either you download and install a recent version (the latest is
v1.3), or you do as the error message suggests: you edit your anneal.inp
file, you locate "MAXCHN=" or "MAXCHN =" (or "maxchn=" or "maxchn =" -
can't tell you which one since I have removed previous versions of CNS
on my workstation) and you increase the figure after the = sign.
I cannot remember if the topology error message is related to the
problem with an insufficient number of chains set in the input file.
HTH,
Fred.
Hussain Bhukyagps wrote:
> Hi,
>
> I'm facing problem in refinement.
> i have a pdb and it is showing the following error in the step of
> annealing.
>
>
>
>
>
> -------------------------- Torsion Topology
> ------------------------------
> -----
> ERROR: A tree has too many chains.
> Please increase MAXCHN and re-run.
>
> %TORSION:TOPOLOGY error encountered: Fatal Topology Error
> (CNS is in mode: SET ABORT=NORMal END)
> *****************************************************
> ABORT mode will terminate program execution.
> *****************************************************
>
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