Are you having difficulty starting B3 version 1.4.0 with XLRstats?This can be related to a little bug in the included version of the xlrstats plugin.
In your xlrstats.xml config file make sure you have a value in:
This should not be empty. If you have an xlrstats website installed make sure you enter the address inside that tag, otherwise fake it like this:
This issue will be fixed in the next release of B3. Meanwhile, use this to get around the bug.