"Failed to load Main-Class manifest attribute" Error when installing JON agent

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Issue

I got an error when trying to install the JON agent on a rhel5 machine. The command I ran was:

java -jar rhq-enterprise-agent-4.4.0.JON311GA.jar --install

and the error was:

Failed to load Main-Class manifest attribute from
rhq-enterprise-agent-4.4.0.JON311GA.jar

Environment

JBoss Operations Network (JON) 3.1.1

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