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In the machine tag in your launch file, you need to specify the env-loader parameter. See: http://wiki.ros.org/roslaunch/XML/machine#Examples

Note that the requirements for the env-loader script are fairly strict. It should:

• Be executable. ( run chmod a+x on it, and make sure the first line is #!/bin/bash )
• Source ROS.
• Set your other environment variables, such as ROS_MASTER_URI and ROS_IP
• The last line MUST be exec "$@"

If you're still having trouble, please EDIT your question to include your launch file and the exact console output you get from trying launch it.