The example run in the Wiki does not appear to have the right syntax.
To test FragGeneScanPlus with a complete genomic sequence,
./FGS+ -genome=./example/NC_000913.fna -out=./example/NC_000913.test -complete=1 -train=complete
If I'm not mistaken, these are not the right command line options for the FGS+ executable (they would work on the Perl script that comes with FragGeneScan).