SWEEPOUT2 error

All -

Any body ever run across this error?

NBONDS: found 2 intra-atom interactions
NBONDS: found 0 intra-atom interactions
%SWEEPOUT2 error encountered: THERE IS A ZERO DETERMINANT
(CNS is in mode: SET ABORT=NORMal END)


ABORT mode will terminate program execution.


Program will stop immediately.
============================================================
Maximum dynamic memory allocation: 1069907480 bytes
Maximum dynamic memory overhead: 5872 bytes
Program started at: 08:48:34 on 24-Jun-2022
Program stopped at: 08:50:22 on 24-Jun-2022
CPU time used: 73.3228 seconds
============================================================

I’m running 2.2 on an older machine. I guess the easiest plan would be to download 2.4 and cns1.3 and reinstall both. Just curious if anybody has ever seen this.

Best,
Ben