problems with GARP_SingleSpecies_BestRuleSet.xml
The workflow "GARP_SingleSpecies_BestRuleSet.xml" (#19 in the GARP example list) will crash if the numIterations parameter is given too small of a value. Actually, the problem is the relative values of several parameters. There is another parameter called 'onissionFraction' (set to 0.1 by default). That parameter times the numIterations must be greater than 'numBestRulesets (=3 by default) or GARP tries to run with a nil ruleset (which crashes everything).