Invalid SP error in running PIMC calculation

Hello,

I was trying to run an ab initio PIMC calculation using QChem version 6.2.2. My own input files were ending with current sp invalid error. I tried example number 9.43 in the latest manual,

</>
$comment
The number of Monte Carlo steps is deliberately set low, more typical
values would be:
PIMC_WARMUP_MCMAX 10000 !Equilibration run
PIMC_MCMAX 100000 !Production run
$end

$molecule
0 1
H
H 1 0.75
$end

$rem
JOBTYPE pimc
METHOD hf
BASIS sto-3g
PIMC_TEMP 298
PIMC_NBEADSPERATOM 32
PIMC_WARMUP_MCMAX 100 !Equilibration run
PIMC_MCMAX 1000 !Production run
PIMC_MOVETYPE 2 !Levy flights
PIMC_SNIP_LENGTH 10 !Moves 8 beads per MC step (10-endpts)
$end
</>
and hit the same problem.

I am not sure how to approach solving this. Any help would be deeply appreciated.

Thanks,
Amartya

With the latest Q-Chem (pre-release v. 6.3), this input runs to completion without error, so I am not sure what the problem is. Can you please paste the end of your output file that contains the exact error message along with the last parts that printed successfully? Use the preformatted text environment (</> button).

I’m copying the full output file so that I don’t miss out on some important information.

Running Job 1 of 1 test.inp
qchem test.inp_3125.0 /tmp/qchem3125/ 1
/Users/amartya/bin/qchem/6.2.0/exe/qcprog.exe_s test.inp_3125.0 /tmp/qchem3125/
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 Q-Chem 6.2.2 for Mac (Intel) OS X

 Parts of Q-Chem use Armadillo 9.900.5 (Nocturnal Misbehaviour).
 http://arma.sourceforge.net/

 Q-Chem begins on Thu Apr 17 17:23:41 2025  

 Host: 
0

     Scratch files written to /tmp/qchem3125//
 Nov1724 |scratch|qcdevops|jenkins|workspace|build_RNUM -1
 Processing $rem in /Users/amartya/bin/qchem/6.2.0/config/preferences:
 Processing $rem in /Users/amartya/.qchemrc:

 Checking the input file for inconsistencies... 	...done.

--------------------------------------------------------------
User input:
--------------------------------------------------------------
$comment
The number of Monte Carlo steps is deliberately set low, more typical
values would be:
PIMC_WARMUP_MCMAX 10000 !Equilibration run
PIMC_MCMAX 100000 !Production run
$end

$molecule
0 1
H
H 1 0.75
$end

$rem
JOBTYPE pimc
METHOD hf
BASIS sto-3g
PIMC_TEMP 298
PIMC_NBEADSPERATOM 32
PIMC_WARMUP_MCMAX 100 !Equilibration run
PIMC_MCMAX 1000 !Production run
PIMC_MOVETYPE 2 !Levy flights
PIMC_SNIP_LENGTH 10 !Moves 8 beads per MC step (10-endpts)
$end

--------------------------------------------------------------
 Requested basis set is STO-3G
 There are 2 shells and 2 basis functions

 Total QAlloc Memory Limit  20480 MB
 Mega-Array Size       188 MB
 MEM_STATIC part       192 MB


 Q-Chem fatal error occurred in module progman/main.C, line 178:

  Problem running Q-Chem: current sp invalid



 Please submit a crash report at q-chem.com/reporter 
 
 

                       Distance Matrix (Angstroms)
             H (  1)
   H (  2)  0.750000

 A cutoff of  1.0D-12 yielded      3 shell pairs
 There are         3 function pairs

This is some sort of a generic exception (according to the code), but I can’t tell what is the root source of the problem. Please contact Q-Chem support.