This error has to deal with a wrong PATH, where the java cannot be found.
So please check your rsed.envvars you are using. Look for the JAVA_HOME environment variable and check it's value, checking that the content exists, like in the example
JAVA_HOME=/usr/lpp/java/J6.0
where /usr/lpp/java/J6.0 should be accesible and contain a bin directory and under this directory you should have the java programs.
Please check both, that the environment variable is set and the JAVA_HOME contents can be accessible and you have a bin directory (the PATH is set to this folder $JAVA_HOME/bin) where the Java Programs reside.
SystemAdmin