The message "Port already in use: 1099" indicates that JMeter is already running on another process. In linux "ps aux | grep -v grep | grep jmeter" should show you all JMeter processes running atm.
The log also indicates that you have connected succefully to a JMeter slave/server. If you are using too instantes of JMeter in the same machine you must use different ports to RMI. Read section 15.3 of JMeter's Remote Distributed Testing Guide (http://jmeter.apache.org/usermanual/remote-test.html)
