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Not sure what that means.
Java 1.7 uses a new version code in the .class file that 1.6 does not recognize.

Compile a source with 1.7 and execute with 1.6 will give you this error:...

If you compile with 1.7 then it will not work on 1.6 (unless you tell javac to create 1.6 code)

I can't see what is wrong. The java command is finding the Main-Class: entry and getting the name of the class.

What version of java are you using? Is the the same as the JDK that created the...

Is the Viniati.class file in the jar file at the root level or in a folder?

Use a zip utility program to look in the jar file and see if the class files are there and are on the correct path and have the correct names.