Getting Exception

[deepgnly]

Running SubscriberExample.java is giving
kx.c$KException: .u.sub
at kx.c.k(c.java:102)
at kx.c.k(c.java:103)
at kx.c.k(c.java:104)
at com.timestored.kdb.examples.SubscriberExample.(SubscriberExample.java:16)
at com.timestored.kdb.examples.SubscriberExample.main(SubscriberExample.java:50)