java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:219)
at kodo.jdbc.meta.InClassNameClassIndicator.loadSubclasses(InClassNameClassIndicator.java:79)
at kodo.jdbc.runtime.JDBCStoreManager.loadSubclasses(JDBCStoreManager.java:1207)
at kodo.jdbc.runtime.JDBCStoreManager.addClassConditions(JDBCStoreManager.java:959)
at kodo.jdbc.runtime.JDBCStoreManager.selectMappings(JDBCStoreManager.java:922)
at kodo.jdbc.runtime.JDBCStoreManager.access$300(JDBCStoreManager.java:32)
at kodo.jdbc.runtime.JDBCStoreManager$SelectImpl.selectInternal(JDBCStoreManager.java:1333)
at kodo.jdbc.sql.AbstractSelect.select(AbstractSelect.java:313)
at kodo.jdbc.sql.AbstractSelect.select(AbstractSelect.java:304)
at kodo.jdbc.query.JDBCExpressionFactory.select(JDBCExpressionFactory.java:137)
at kodo.jdbc.query.JDBCQuery.executeQuery(JDBCQuery.java:111)
at kodo.query.JDOQLQuery$DataStoreQueryExecutor.executeQuery(JDOQLQuery.java:474)
at kodo.query.AbstractQuery.executeWithMap(AbstractQuery.java:693)
at kodo.query.AbstractQuery.executeWithArray(AbstractQuery.java:640)
at kodo.query.AbstractQuery.execute(AbstractQuery.java:622)
at com.transmachina.idiomatica.db.DbSession.get(DbSession.java:536)
at com.transmachina.idiomatica.app.WebDictionaryManager.hasBeenPreviouslyLookedUp(WebDictionaryManager.java:26)
at com.transmachina.idiomatica.app.WebDictionaryManager.doLookup(WebDictionaryManager.java:39)
at com.transmachina.idiomatica.utils.WordSearch.lookupAndReturnMatches(WordSearch.java:374)
at com.transmachina.idiomatica.utils.WordSearch.getWordMatches(WordSearch.java:345)
at com.transmachina.idiomatica.utils.WordSearch.getMatchesWithPosTrimming(WordSearch.java:546)
at com.transmachina.idiomatica.engine.parser.ambiguity.WordAmbiguity.setupWordAmbiguity(WordAmbiguity.java:98)
at com.transmachina.idiomatica.engine.parser.ambiguity.TextAmbiguity.setupTextAmbiguity(TextAmbiguity.java:271)
at com.transmachina.idiomatica.engine.parser.ambiguity.ParsedText.setupParsedText(ParsedText.java:141)
at com.transmachina.idiomatica.engine.presentation.Parser.parseToVectorOfWords(Parser.java:92)
at com.transmachina.idiomatica.engine.presentation.Parser.getWord(Parser.java:377)
at com.transmachina.idiomatica.engine.presentation.Parser.getPassage(Parser.java:193)
at com.transmachina.idiomatica.engine.presentation.Parser.getPassage(Parser.java:158)
at com.transmachina.idiomatica.adminTool.frame.translation.FrameTranslation$5.run(FrameTranslation.java:231)

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