[CP2K-user] [CP2K:21316] "GEOMETRY wrong or EMAX_SPLINE too small!" error in FIST classical MD of water

[Jürg Hutter]

Hi

you most likely have 'overlapping' atoms due to PBC. Please check your input coordinates
for this point.

best
JH

________________________________________
From: 'Akanksha' via cp2k <cp2k at googlegroups.com>
Sent: Sunday, March 30, 2025 10:44 PM
To: cp2k
Subject: [CP2K:21312] "GEOMETRY wrong or EMAX_SPLINE too small!" error in FIST classical MD of water

Hello all,

I am trying to run classical MD for a water box on the CP2K 2024.2 version using the input file from this exercise:
https://www.cp2k.org/exercises:2018_ethz_mmm:h2o_md

I kept my input parameters exactly the same. And the calculations went through smoothly.

Next, the only difference I made was -
I put the given coordinates into a separate .xyz file (attached with the email) and corrected it as needed into the proper chemical file format. Then, I changed the "subsys" section as follows -
  &SUBSYS
    &CELL
      ABC 9.865 9.865 9.865
    &END CELL
    &TOPOLOGY
        COORD_FILE_FORMAT   XYZ
        COORD_FILE_NAME       ${COORDFILE}
    &END TOPOLOGY
  &END SUBSYS
In this case, the calculation stops immediately, and I get the error -
"GEOMETRY wrong or EMAX_SPLINE too small!"

I have tried these things but I get the same error every time:
1) Used a completely different xyzfile.
2) Moved some molecules around so they are not that close in the initial geometry
3) Increased the value of EMAX_SPLINE to 2.0

I do not understand why exactly the same coordinates would not work in different file formats when I haven't changed anything else. Could anyone please help me with this?
Thank you very much!

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