MW-eABF error: specified 1 reference frames, but gspath requires at least 2 frames

From: Ashutosh Shandilya (scfbioiitd_at_gmail.com)
Date: Thu Feb 17 2022 - 11:16:46 CST

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Dear Users,
I am getting the following error, when I am running EABF

you have specified 1 reference frames, but gspath requires at least 2 frames

My input files looks something like this
MW.tcl

colvar {

   #Progress along the path

     name gs

                width 0.05

                lowerboundary 0

                upperboundary 1

                extendedlagrangian on

                extendedfluctuation 0.5

                gspath {

               atoms {atomnumbers { 12961 12975 12985 13001 13023 13037
13047 13062 13076 13083 13104 13123 13140 13164 61335 61365 61397 61429
61459 61492 61524 61557 61589 61622 61655 61688 61721 61751 61783 61816
61848 61880 }}

                refPositionsFile1 ../1.pdb

                       }

                gspath {

               atoms {atomnumbers { 12961 12975 12985 13001 13023 13037
13047 13062 13076 13083 13104 13123 13140 13164 61335 61365 61397 61429
61459 61492 61524 61557 61589 61622 61655 61688 61721 61751 61783 61816
61848 61880 }}

                refPositionsFile11 ../11.pdb

        }

                gspath {

               atoms {atomnumbers { 12961 12975 12985 13001 13023 13037
13047 13062 13076 13083 13104 13123 13140 13164 61429 61459 61492 61524
61557 61589 61622 61655 61688 61721 61751 61783 61816 61848 61880 }}

                refPositionsFile21 ../21.pdb

        }

 abf {

                        colvars gs

                        fullSamples 500

                        historyfreq 10000

                        shared yes

                        sharedFreq 5

                    }

colvars on

set num_replicas 11

set temperature 300

set steps_per_run 1000

set num_runs 1000

set runs_per_frame 10

set frames_per_restart 5

set output_root "output/%s/" ;

cv configfile mw.tcl

Any suggestions please.

Regards,

Ashutosh

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