org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'mapping-file'. One of '{"http://java.sun.com/xml/ns/persistence":class, "http://java.sun.com/xml/ns/persistence":exclude-unlisted-classes, "http://java.sun.com/xml/ns/persistence":properties}' is expected.

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cvc-complex-type.2.4.a: Invalid content was found starting with element 'mapping-file'. One of '{"http://java.sun.com/xml/ns/persistence":class, "http://java.sun.com/xml/ns/persistence":exclude-unlisted-classes, "http://java.sun.com/xml/ns/persistence":properties}' is expected.
org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'mapping-file'. One of '{"http://java.sun.com/xml/ns/persistence":class, "http://java.sun.com/xml/ns/persistence":exclude-unlisted-classes, "http://java.sun.com/xml/ns/persistence":properties}' is expected.	at com.solarmetric.conf.Configurations.load(Configurations.java:582)	at com.solarmetric.conf.Configurations.populateConfiguration(Configurations.java:474)	at kodo.enhance.PCEnhancer.run(PCEnhancer.java:3753)	at kodo.enhance.PCEnhancer.main(PCEnhancer.java:3720)