ERROR [main] 2011-01-14 15:37:49,965 DatabaseDescriptor.java (line 388) Fatal error: null; mapping values are not allowed here

When starting cassandra

ERROR [main] 2011-01-14 15:37:49,965 DatabaseDescriptor.java (line 388) Fatal error: null; mapping values are not allowed here


Solution:
This means you have a problem with the configuration file(cassandra.yaml). make sure the changes you have made to the file are correct