Seems like I am having the same issue. For a molecular crystal with the following input:
* TYPE OF RUN AND SYSTEM *
******************************************
USPEX : calculationMethod (USPEX, VCNEB, META)
310 : calculationType (dimension: 0-3; molecule: 0/1; varcomp: 0/1)
1 : AutoFrac
% optType
enthalpy
% EndOptType
% atomType
C H
% EndAtomType
% numSpecies
4
% EndNumSpecies
******************************************
* POPULATION *
******************************************
20 : populationSize
20 : initialPopSize
20 : numGenerations
6 : stopCrit
1 : reoptOld
******************************************
* VARIATION OPERATORS *
******************************************
0.50 : fracGene
0.20 : fracRand
0.10 : fracAtomsMut
0.20 : fracRotMut
0.00 : fracPerm
0.00 : fracLatMut
****************************************
* CONSTRAINTS *
****************************************
% IonDistances
2.0 1.2
1.2 0.7
% EndDistances
% MolCenters
2.8
% EndMol
*****************************************
* DETAILS OF AB INITIO CALCULATIONS *
*****************************************
% abinitioCode
0 0 0 0
% ENDabinit
1 : whichCluster