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java.lang.NullPointerException: 	at org.hsqldb.Schema.findReference(Unknown Source)	at org.hsqldb.SchemaManager.findSynonym(Unknown Source)	at org.hsqldb.ParserDQL.readTableName(Unknown Source)	at org.hsqldb.ParserDQL.readTableOrSubquery(Unknown Source)	at org.hsqldb.ParserDQL.XreadTableReference(Unknown Source)	at org.hsqldb.ParserDQL.XreadFromClause(Unknown Source)	at org.hsqldb.ParserDQL.XreadTableExpression(Unknown Source)	at org.hsqldb.ParserDQL.XreadQuerySpecification(Unknown Source)	at org.hsqldb.ParserDQL.XreadSimpleTable(Unknown Source)	at org.hsqldb.ParserDQL.XreadQueryPrimary(Unknown Source)	at org.hsqldb.ParserDQL.XreadQueryTerm(Unknown Source)	at org.hsqldb.ParserDQL.XreadQueryExpressionBody(Unknown Source)	at org.hsqldb.ParserDQL.XreadQueryExpression(Unknown Source)	at org.hsqldb.ParserDQL.compileCursorSpecification(Unknown Source)	at org.hsqldb.ParserCommand.compilePart(Unknown Source)	at org.hsqldb.ParserCommand.compileStatements(Unknown Source)	at org.hsqldb.Session.executeDirectStatement(Unknown Source)	at org.hsqldb.Session.execute(Unknown Source)	at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)	at org.hsqldb.jdbc.JDBCStatement.executeQuery(Unknown Source)	at workbench.sql.commands.SelectCommand.execute(SelectCommand.java:138)	at workbench.sql.StatementRunner.runStatement(StatementRunner.java:552)	at workbench.gui.sql.SqlPanel.displayResult(SqlPanel.java:3399)	at workbench.gui.sql.SqlPanel.runStatement(SqlPanel.java:2160)	at workbench.gui.sql.SqlPanel$4.run(SqlPanel.java:2098)