The message means that you should run pp.x again on an input file having the first namelist empty :
&inputpp
 /
followed by your namelist &plot with all yourdata. You may need to specify in filepp(1) the same file name as in variable filplot:
&plot
 filepp(1) =  'num7_2D_CNT250526',
 ...
/
There is a technical reason I don't remember for this behavior.

Paolo

On 14/06/2025 08:06, Toshiharu Higuchi via users wrote:
Dear QE users,
I am calculating the distributions of |psi|^2 in vacuum space when an
electric field is applied to the carbon nanotube. I can see the calculation
result in a 3D plot (XCrySDen). However, when I tried to see it in 2D plot
and I put the following pp.in, the following error appeared. I don't know
how to deal with it. If anyone knows, please let me know.

Best regards,
Toshiharu Higuchi

%%%%%%%%%%%%%%%%%%%%%%
BEWARE: plot requiring G-space interpolation not implemented for Gamma only!
SOLUTION: restart this calculation with emtpy namelist &inputpp
%%%%%%%%%%%%%%%%%%%%%%

******************************
Toshiharu Higuchi
Yokohama, Japan
E-mail: toshi1h...@docomo.ne.jp
******************************

[1] pp.in file is as follows

&INPUTPP
                       prefix = 'Capped_5,5_CNT250526' ,
                       outdir = '/home/user/tmp' ,
                      filplot = 'num7_2D_CNT250526' ,
                     plot_num = 7,
                    kpoint(1) = 1,
                    kpoint(2) = 1,
                     kband(1) = 135,
                     kband(2) = 146,
                        lsign = .true. ,
  /
  &PLOT
                        nfile = 1 ,
                    weight(1) = 1.0,
                      fileout = '.xsf' ,
                        iflag = 2 ,
                output_format = 3 ,
                        e1(1) = 2.0,
                        e1(2) = 0.0,
                        e1(3) = 0.0,
                        e2(1) = 0.0,
                        e2(2) = 2.0,
                        e2(3) = 0.0,
                        x0(1) = 0.0,
                        x0(2) = 0.0,
                        x0(3) = 0.0,
                           nx = 100 ,
                           ny = 100 ,
  /


[2] pp.out is as follows

      Above omitted

      Plotting k_point =   1  band =143
      Writing data to file  num7_2D_CNT250526_K001_B143
      Calling punch_plot, plot_num =   7
      Plotting k_point =   1  band =144
      Writing data to file  num7_2D_CNT250526_K001_B144
      Calling punch_plot, plot_num =   7
      Plotting k_point =   1  band =145
      Writing data to file  num7_2D_CNT250526_K001_B145
      Calling punch_plot, plot_num =   7
      Plotting k_point =   1  band =146
      Writing data to file  num7_2D_CNT250526_K001_B146
      Reading data from file  num7_2D_CNT250526_K001_B135

      Writing data to be plotted to file num7_2D_CNT250526_K001_B135.xsf

BEWARE: plot requiring G-space interpolation not implemented for Gamma only!
SOLUTION: restart this calculation with emtpy namelist &inputpp

  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
      Error in routine chdens (1):
      Not implemented, please read above
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

      stopping ...


[3] for reference: pw.in file is as follows

&CONTROL
                        title = 'Capped_5,5_CNT250526' ,
                  calculation = 'scf' ,
                 restart_mode = 'from_scratch' ,
                   wf_collect = .true. ,
                       outdir = '/home/user/tmp/' ,
                   pseudo_dir =
'/home/user/user/espresso-5.0.1/espresso-5.0.1/pseudo/' ,
                       prefix = 'Capped_5,5_CNT250526' ,
                    verbosity = 'high' ,
                      tstress = .false. ,
                      tprnfor = .false. ,
                      tefield = .true. ,
                     dipfield = .true. ,
                     lelfield = .false. ,
  /
  &SYSTEM
                        ibrav = 8,
                            A = 14.0 ,
                            B = 14.0 ,
                            C = 45.0 ,
                          nat = 80,
                         ntyp = 2,
                      ecutwfc = 30 ,
                      ecutrho = 120 ,
                         nbnd = 279,
                  occupations = 'smearing' ,
          starting_spin_angle = .true. ,
                      degauss = 0.003675 ,
                     smearing = 'gaussian' ,
                        nspin = 1 ,
             exxdiv_treatment = 'gygi-baldereschi' ,
                         edir = 3 ,
                      emaxpos = 0.9 ,
                       eopreg = 0.2 ,
                         eamp = 0.014585 ,
              assume_isolated = 'martyna-tuckerman' ,
                          nr1 = 36 ,
  /
  &ELECTRONS
             electron_maxstep = 2000,
                     conv_thr = 1.D-6 ,
                  mixing_mode = 'plain' ,
                  mixing_beta = 0.05 ,
  /
ATOMIC_SPECIES
     C   12.00000  C.pz-rrkjus.UPF
     H    1.00000  H.pz-rrkjus.UPF
ATOMIC_POSITIONS angstrom
     C      6.861800000    8.213200000   18.171550000
     C      8.093700000    7.530300000   18.171550000
     C      7.824900000    6.147700000   18.171550000

    omission

     C      3.633900000    7.000000000   25.607350000
     C      5.959800000    3.798600000   25.607350000
     C      4.747600000    4.498500000   25.607350000
     C      8.683100000    4.084800000   25.607350000
     C      9.723300000    5.021400000   25.607350000
     H     10.366100000    7.000000000   26.828450000
     H      8.040200000   10.201400000   26.828450000
     H      9.252400000    9.501500000   26.828450000
     H      5.316900000    9.915200000   26.828450000
     H      4.276700000    8.978600000   26.828450000
     H      4.276700000    5.021400000   26.828450000
     H      3.707400000    6.300100000   26.828450000
     H      6.648100000    3.652300000   26.828450000
     H      8.040200000    3.798600000   26.828450000
     H     10.075100000    5.630900000   26.828450000
K_POINTS gamma

_______________________________________________________________________________
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worldwide who are victims of terrorism, military aggression, and indiscriminate 
warfare.
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--
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 206, 33100 Udine Italy, +39-0432-558216

_______________________________________________________________________________
The Quantum ESPRESSO Foundation stands in solidarity with all civilians 
worldwide who are victims of terrorism, military aggression, and indiscriminate 
warfare.
--------------------------------------------------------------------------------
Quantum ESPRESSO is supported by MaX (www.max-centre.eu)
users mailing list users@lists.quantum-espresso.org
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