(a) Just tried to increase (Main > Server Configuration > Tweak Settings) to 2048
And tried again to run command;
And get the same error message.
Tried that before as well, with memory bumped up to 512, then 1024, but still get same error.
(b) Also have tried re-installing LSWS several times, by going to WHM, select LSWS, then click on "Uninstall" number of times during un-install process, selected to retain config files, then other times selected to remove / delete config files, but in both cases still cannot use Build matching PHP binary menu option.