I use Fluent.Â
Following are the steps for an error to appear:
1. Open Fluent without Workbench.
2. Import mesh which is made with Gmsh app.
  (the file format is ".unv")
3. Energy eq.: ON
4. Select "Species transport" for Species model.
5. Reactions: Volmetric ON
6. Select "CHEMKIN-CFD Solver" for chemistory solver.
7. Import CHEMKIN format mechanism
  (Select three types files: "chem.inp", "thermo.dat", "tran.dat"
8. When I click the "import" button, the error(code: 127) appears.
The chemical reaction model to be used are following three mechanisms(only input file):
1. Connaire mech:
elements
h c o n ar
end
species
Â
Â
h      h2     o       o2     oh       Â
h2o     n2     ho2      h2o2    ar       Â
end
reactions              cal/mole
  h+o2 = o+oh  1.915E+14  0.00 1.644E+04
       rev / 5.481E+11  0.39 -2.930E+02 /
  o+h2 = h+oh  5.080E+04  2.67 6.292E+03
       rev / 2.667E+04  2.65 4.880E+03 /
  oh+h2 = h+h2o  2.160E+08  1.51 3.430E+03
       rev / 2.298E+09  1.40 1.832E+04 /
  o+h2o = oh+oh  2.970E+06  2.02 1.340E+04
       rev / 1.465E+05  2.11 -2.904E+03 /
  h2+m = h+h+m   4.577E+19 -1.40 1.044E+05
       rev / 1.146E+20 -1.68 8.200E+02 /
  h2/2.5/ h2o/12.0/
  o2+m = o+o+m   4.515E+17 -0.64 1.189E+05
       rev / 6.165E+15 -0.50 0.000E+00 /
  h2/2.5/ h2o/12.0/ ar/0.83/
  oh+m = o+h+m   9.880E+17 -0.74 1.021E+05
       rev / 4.714E+18 -1.00 0.000E+00 /
  h2/2.5/ h2o/12.0/ ar/0.75/
  h2o+m = h+oh+m   1.912E+23 -1.83 1.185E+05
       rev / 4.500E+22 -2.00 0.000E+00 /
  h2/0.73/ h2o/12.0/ ar/0.38/
  h+o2(+m) = ho2(+m) 1.475E+12 0.60 0.000E+00
!      rev / 3.090E+12 0.53 4.887E+04 /
      low / 3.4820E+16 -4.1100E-01 -1.1150E+03 /
  troe/0.5 1.0000E-30 1.0000E+30 1.0000E+100 /
  h2/1.3/ h2o/14.0/ ar/0.67/
  ho2+h = h2+o2  1.660E+13  0.00 8.230E+02
       rev / 3.164E+12  0.35 5.551E+04 /
  ho2+h = oh+oh  7.079E+13  0.00 2.950E+02
       rev / 2.027E+10  0.72 3.684E+04 /
  ho2+o = oh+o2  3.250E+13  0.00 0.000E+00
       rev / 3.252E+12  0.33 5.328E+04 /
  ho2+oh = h2o+o2  2.890E+13  0.00 -4.970E+02
       rev / 5.861E+13  0.24 6.908E+04 /
  h2o2+o2 = ho2+ho2   4.634E+16 -0.35 5.067E+04
       rev / 4.200E+14  0.00 1.198E+04 /
  DUPLICATE
  h2o2+o2 = ho2+ho2   1.434E+13 -0.35 3.706E+04
       rev / 1.300E+11  0.00 -1.629E+03 /
  DUPLICATE
  h2o2(+m) = oh+oh(+m) 2.951E+14  0.00 4.843E+04
!     rev / 3.656E+08  1.14 -2.584E+03 /
      low / 1.202E+17 0.00 45500. /
    troe /0.5 1.0e-30 1.0e+30 1.0e+100/
    h2/2.5/ h2o/12.0/ ar/0.64/
  h2o2+h = h2o+oh  2.410E+13  0.00 3.970E+03
       rev / 1.269E+08  1.31 7.141E+04 /
  h2o2+h = h2+ho2  6.025E+13  0.00 7.950E+03
       rev / 1.041E+11  0.70 2.395E+04 /
  h2o2+o = oh+ho2  9.550E+06  2.00 3.970E+03
       rev / 8.660E+03  2.68 1.856E+04 /
  h2o2+oh = h2o+ho2   1.000E+12  0.00 0.000E+00
       rev / 1.838E+10  0.59 3.089E+04 /
  DUPLICATE
  h2o2+oh = h2o+ho2   5.800E+14  0.00 9.557E+03
       rev / 1.066E+13  0.59 4.045E+04 /
  DUPLICATE
end
Â
2. Boivin mech:Â
ELEMENTS
N H OÂ
END
SPECIES
N2Â Â Â Â Â Â Â Â HÂ Â Â Â Â Â Â Â Â O2Â Â Â Â Â Â Â Â OHÂ Â Â Â Â Â Â Â OÂ Â Â Â Â Â Â Â Â H2Â Â Â Â Â Â Â Â H2OÂ Â Â Â Â Â Â Â HO2Â Â Â Â Â Â Â Â H2O2Â Â Â Â Â Â Â Â Â Â Â
END
REACTIONS
H+O2 <=> OH+OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 3.520e+16Â Â -0.700Â 17069.80
H2+O <=> OH+HÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5.060e+04Â Â 2.670Â Â 6290.63
H2+OH <=> H2O+HÂ Â Â Â Â Â Â Â Â Â Â Â Â Â 1.170e+09Â Â 1.300Â Â 3635.28
2 H+M <=> H2+MÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1.300e+18Â Â -1.000Â Â Â 0.00
H2/2.50/ H2O/12.00/
H+OH+M <=> H2O+MÂ Â Â Â Â Â Â Â Â Â Â Â Â Â 4.000e+22Â Â -2.000Â Â Â 0.00
H2/2.50/ H2O/12.00/
H+O2(+M) => HO2(+M)Â Â Â Â Â Â Â Â Â Â Â Â 4.650e+12Â Â 0.440Â Â Â 0.00
H2/2.50/ H2O/16.00/ O2/1.0/
   LOW / 5.750e+19  -1.400   0.00 /
   TROE/   0.5  1e-30   1e+30    /
HO2+H => 2 OHÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 7.080e+13Â Â 0.000Â Â 295.00
HO2+H <=> H2+O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1.660e+13Â Â 0.000Â Â 823.00
HO2+OH => H2O+O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2.890e+13Â Â 0.000Â Â -497.13Â Â Â Â Â Â Â Â Â Â Â Â Â Â
H2O2(+M) => 2 OH(+M)Â Â Â Â Â Â Â Â Â Â Â Â 2.623e+19Â Â -1.388Â 51323.00
H2/2.00/ H2O/6.00/Â
   LOW / 8.153e+23  -1.918   49621.00 /
   TROE/  0.735  94   1756.00    /
2 HO2 => H2O2+O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â 3.020e+12Â Â 0.000Â Â 1386.23Â Â Â Â Â Â Â Â
HO2+H2 => H2O2+HÂ Â Â Â Â Â Â Â Â Â Â Â Â Â 1.624e+11Â Â 0.607Â 23933.00
END
3. UT-JAXA mech:
ELEMENTSÂ
H O N AR HE
END
Â
SPECIESÂ
H O OH H2 O2 HO2 H2O H2O2 N2 AR HEÂ
END
Â
REACTIONSÂ Â Â Â Â Â Â Â Â Â Â Â Â Â cal/mole
OH+H2 = H2O+H 2.160E+08 1.51 3.43E+03 !n LLNL
H +O2 = OH+OÂ Â Â Â Â Â Â Â Â Â 1.910E+14Â Â Â Â 0.0Â Â Â Â 1.644E+04 ! LLNL
O +H2 = OH+H 5.080E+04 2.67 6.292E+03 !a (Sutherland)
Â
! HO2 reactions
OH+HO2 = H2O+O2Â Â Â Â Â Â Â Â Â Â 2.890E+13Â Â Â Â 0.0Â Â Â Â -5.0E+02 !n
H +HO2 = H2+O2Â Â Â Â Â Â Â Â Â Â 3.660E+06Â Â Â Â 2.087Â Â -1.45E+03 !Michael, Reverse Reaction
H +HO2 = OH+OHÂ Â Â Â Â Â Â Â Â Â 7.080E+13Â Â Â Â 0.0Â Â Â Â 3.0E+02 !Muller
H +HO2 = H2O+OÂ Â Â Â Â Â Â Â Â Â 1.340E+13Â Â Â Â 0.0Â Â Â 1.34E+03 !Boldwin, revised
O +HO2 = O2+OH 3.250E+13 0.0 Â Â 0.000E+00Â !b
!
HO2+HO2 = H2O2+O2 4.200E+14Â Â Â Â 0.0Â Â Â 1.2E+04Â !c
HO2+HO2(+M) = H2O2+O2(+M) 1.320E+11Â Â Â Â 0.0Â Â Â -1.192E+03Â !p
              LOW/ 6.890E+14    0.0   -1.947E+03/ !p
Â
OH+OH = O+H2O 4.330E+03 2.7 -2.485E+03 !a
Â
! H2O2 reactions
H2O2+H = H2O+OHÂ Â Â Â Â Â Â Â Â Â 8.190E+08Â Â Â Â 1.55Â Â 3.455E+03Â !o set-ii
H2O2+H = HO2+H2Â Â Â Â Â Â Â Â Â Â 8.067E+19Â Â Â -1.574Â 1.6838E+04Â !o
DUPLICATE
H2O2+H = HO2+H2Â Â Â Â Â Â Â Â Â Â 1.042E+13Â Â Â Â 0.0Â Â Â 6.569E+03Â !o
DUPLICATE
H2O2+OH = H2O+HO2 1.700E+18Â Â Â Â 0.0Â Â Â 2.9407E+04 !nÂ
DUPLICATE
H2O2+OH = H2O+HO2 2.000E+12 0.0 Â 4.27E+02 !nÂ
DUPLICATE
H2O2+O =HO2+OH 6.620E+11 0.0 3.974E+03 !b
Â
! reaconbination reactions
! H+O2+M
H+O2(+M) = HO2(+M)Â Â Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â Â 0.000E+00Â !n
    LOW/ 4.57E+18 -1.120 0.0/               !h (Ar)
    TROE/ 0.62 1.0E-10 1.0E+10/              !i
    O2/0.0/ H2O/0.0/ H2/0.0/ N2/0.0/ HE/0.0/       !
H+O2(+H2) = HO2(+H2)Â Â Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â 0.000E+00Â !n
    LOW / 3.52E+18 -0.896 0.0/              !fit h
    TROE/ 0.5 1.0E-10 1.0E+10/
H+O2(+N2) = HO2(+N2)Â Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â Â 0.000E+00Â !n
    LOW/ 1.75E+19 -1.232 0.0/               !h (N2)
    TROE/ 0.67 1.0E-10 1.0E+10/              !i
H+O2(+O2) = HO2(+O2)Â Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â Â 0.000E+00Â !n
    LOW/ 1.41E+18 -0.849 0.0/               !h (O2),fit K. Hasegawa
    TROE/ 0.5 1.0E-10 1.0E+10/
H+O2(+H2O) = HO2(+H2O)Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â Â 0.000E+00Â !n
    LOW/ 3.63E+19 -1.0 0.0/                !n
    TROE/ 0.81 1.0E-10 1.0E+10/              !n
H+O2(+HE) = HO2(+HE)Â Â Â Â Â Â Â Â 1.933E+12Â Â Â Â 0.56Â Â Â 0.000E+00Â !i,h
    LOW / 2.83E+19 -1.32 359.6/              ! fit to fig.12 of Micheal
    TROE/ 0.59 1.0E-10 1.0E+10/              !i
!
H+H+M = H2+MÂ Â Â Â Â Â Â Â Â Â Â 7.000E+17Â Â Â -1.0Â Â Â Â 0.000E+00Â !e
    H2/0.0/ H/0.0/ O2/2.2/ H2O/14.4/ N2/0.0/    !e
H+H+H2 = H2+H2Â Â Â Â Â Â Â Â Â Â 1.000E+17Â Â Â -0.6Â Â Â Â 0.000E+00Â !e
H+H+N2 = H2+N2Â Â Â Â Â Â Â Â Â Â 5.400E+18Â Â Â -1.3Â Â Â Â 0.000E+00Â !e
H+H+H = H2+HÂ Â Â Â Â Â Â Â Â Â Â 3.200E+15Â Â Â Â 0.0Â Â Â Â 0.000E+00Â !e
!
H+OH+M = H2O+MÂ Â Â Â Â Â Â Â Â Â 3.500E+22Â Â Â -2.0Â Â Â Â 0.000E+00Â Â Â !adjustÂ
    H2O/12.0/ AR/0.38/ HE/0.38/                !n=>H2O/6.4/
Â
H+O+M = OH+MÂ Â Â Â Â Â Â Â Â Â Â 6.750E+18Â Â Â -1.0Â Â Â Â 0.000E+00Â !k (cited by Konnov)
    H2O/5.0/Â
Â
O+O+M = O2+MÂ Â Â Â Â Â Â Â Â Â Â 6.160E+15Â Â Â -0.5Â Â Â Â 0.000E+00Â !d
    H2/2.5/ H2O/12.0/ AR/0.0/
O+O+AR = O2+ARÂ Â Â Â Â Â Â Â Â Â 1.890E+13Â Â Â Â 0.0Â Â -1.79E+03Â !d
O+O+HE = O2+HEÂ Â Â Â Â Â Â Â Â Â 1.890E+13Â Â Â Â 0.0Â Â -1.79E+03Â !
!
O+OH+M = HO2+MÂ Â Â Â Â Â Â Â Â Â 1.350E+15Â Â Â -0.216Â Â Â 0.000E+00Â !German & MillerÂ
!
H2O2(+M) = OH+OH(+M)Â Â Â Â Â Â Â 3.0000E+14Â Â Â 0.0Â Â Â 4.8482E+04 !n
    LOW /2.2900E+16   0.0   43634./!m (AR)
    TROE/0.44 1.0E-10 1.0E+10/              !m
    H2O/15.0/ H2/3.0/ O2/2.2/ N2/3.0/          !Rule of Thumb
Additionally, I tried the method to use console to import CHEMKIN format file, but the error also occurs.
If you need more imformation, I would like you to ask me.