[antlr-interest] run error

[karina valdivia]

While trying to run "antlr-2.7.3.jar file" on my computer gave me an error 
message: 
 
java.lang.UnsupportedClassVersionError:
*antlr/TokenStreamException*(Unsupported
major.minor version 49.0)

at java.lang.ClassLoader.defineClass0(*Native Method*)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$100(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(*Native Method*)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Exception in thread "main" 
I use j2sdk1.4.2.
What could i do?
 Thanks
 Karina
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