are you doing custom vein miner stuff, like changing the vein miner configs? Or maybe did you add a mod that adds ores? Or perhaps remove a mod, that the FTB team had in there, and had customized vein miner to work with whatever you removed?
"at portablejim.veinminer.configuration.ConfigurationSettings.addBlockToWhitelist(ConfigurationSettings.java:181)"
the best place to start is probably 'what changed'?
what mods did you add/remove, and/or what configs did you change?