A library is using code compiled with an unsupported version of Java.

[skatewizard]

Hi! Peasycam in Processing 2.2.1 is giving me this error:

UnsupportedClassVersionError: A library is using code compiled with an unsupported version of Java.

This version of Processing only supports libraries and JAR files compiled
for Java 1.6 or earlier. A library used by this sketch was compiled for
Java 1.7 or later, and needs to be recompiled to be compatible with Java 1.6.

I tried changing the Java versions but no results...