[Swarm-Support] An error running java version

[Alan Calderón]

I have already registered PATH, CLASSPATH and SWARMHOME variables, at
system level and specific user level, but nevertheless keep receiving
this message when trying to execute executable jar files: 

Failed to load Main-Class manifest attribute from C:\Swarm-2.2-java\share\swarm\swarm.jar

I undestand this is somehow related to the impossibility of finding the main class, but shouldn't be enough to configure PATH, CLASSPATH and defining SWARMHOME environment variable? Thank you in advance for any help,

Alan Calderon
Universidad de Costa Rica