java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
java.util.ConcurrentModificationException:
at com.solarmetric.kodo.runtime.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:98)
at com.solarmetric.kodo.runtime.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:66)
at com.solarmetric.kodo.impl.jdbc.ee.JDOConnectionFactory.getConnection(JDOConnectionFactory.java:108)
at com.solarmetric.kodo.impl.jdbc.ee.JDOConnectionFactory.getConnection(JDOConnectionFactory.java:88)
at dk.pine.core.util.DatabaseConnection.open(DatabaseConnection.java:39)

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