[17:39:25] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Random.java:300) ~[?:1.7.0_51]
at mrtjp.projectred.exploration.GenerationManager.generate(GenerationManager.java:38) ~[GenerationManager.class:?]

how to reproduce:
0)Single Player -> create new world - > create new world
1)crash

crashlog: http://paste.ee/p/kUc5t

You are wrong, my configs are default.

gen_Ruby_resistance = localConfig.get("World Generation", "Ruby Ore resistance", 0).getInt();
https://github.com/MrTJP/ProjectRed/blob/master/src/mrtjp/projectred/core/Configurator.java
:)

and it should be more than zero...
http://docs.oracle.com/javase/7/docs/api/java/util/Random.html#nextInt%28%29

You are quite right, fixed. new version will be up in a few minutes.

in your configs, "Ruby Ore Resistance" is set to a negative value.