Read previous posts about renaming corresponding jnlp files with same name as vcr files and try again.
Latest script is in following post.
Code:
http://stream-recorder.com/forum/showpost.php?p=33155&postcount=38
also make sure that Demo.vcr runs properly before trying with other files.
latest version of java available is JRE 7 update 1.
Code:
http://www.oracle.com/technetwork/java/javase/downloads/jre-7u1-download-513652.html