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runtime error with WSAD 5.1.2

 
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I try running a class using WSAD 5.1.2.

I get the following error: java.lang.UnsupportedClassVersionError

The javadoc specifies this as being thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.

Any recommendation on resolving this problem would be much appreciated.

- Mike
 
It is sorta covered in the JavaRanch Style Guide.
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