An error occurred while executing action Execute DDL commands.

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When running the project locally using the build-in database it gives the error below. I already removed the associations and replaced it with a new on, but nothing seems to help. When I change the settings to run the project on a PostgreSQL database the project runs fine. I don't understand why. Any thoughts on this?     com.mendix.m2ee.api.AdminException: Executing DDL commands failed.     at com.mendix.basis.component.internal.LocalComponentImpl.executeDDLCommands(LocalComponentImpl.scala:115) Caused by: com.mendix.basis.connectionbus.ConnectionBusException: Error (SQL State: 42501, Error Code: -5501) on executing: ALTER TABLE "bag$gemeenten_taak" DROP CONSTRAINT "uniq_bag$gemeenten_taak_bag$gemeentenid" All changes are rolled back.     at com.mendix.connectionbus.modelsynchronization.DdlCommandExecutor.execute(DdlCommandExecutor.java:79) Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: uniq_bag$gemeenten_taak_bag$gemeentenid     at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)     at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)     at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)     at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source)     at org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:291)     at org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:291)     at com.mendix.connectionbus.modelsynchronization.DdlCommandExecutor.executeDdlCommands(DdlCommandExecutor.java:136)     at com.mendix.connectionbus.modelsynchronization.DdlCommandExecutor.execute(DdlCommandExecutor.java:43)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.synchronizeModel(SynchronizationManager.scala:170)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.executeImpl(SynchronizationManager.scala:161)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.execute(SynchronizationManager.scala:108)     at com.mendix.connectionbus.ConnectionBusImpl.executeDDLCommands(ConnectionBusImpl.java:392)     at com.mendix.basis.component.internal.LocalComponentImpl.executeDDLCommands(LocalComponentImpl.scala:107)     at com.mendix.basis.impl.MxRuntimeImpl.executeDDLCommands(MxRuntimeImpl.java:1009)     at com.mendix.basis.action.admin.ExecuteDDLCommandsAction.call(ExecuteDDLCommandsAction.java:26)     at com.mendix.basis.action.admin.RuntimeAdminAction.execute(RuntimeAdminAction.java:18)     at com.mendix.m2ee.appcontainer.server.handler.HttpAdminHandler.handle(HttpAdminHandler.java:129)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)     at org.eclipse.jetty.server.Server.handle(Server.java:502)     at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)     at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)     at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)     at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)     at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)     at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)     at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)     at java.lang.Thread.run(Thread.java:748) Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: uniq_bag$gemeenten_taak_bag$gemeentenid     at org.hsqldb.error.Error.error(Unknown Source)     at org.hsqldb.error.Error.error(Unknown Source)     at org.hsqldb.SchemaManager.getSchemaObject(Unknown Source)     at org.hsqldb.ParserDQL.readSchemaObjectName(Unknown Source)     at org.hsqldb.ParserDDL.compileAlterTableDropConstraint(Unknown Source)     at org.hsqldb.ParserDDL.compileAlterTable(Unknown Source)     at org.hsqldb.ParserDDL.compileAlter(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.execute(Unknown Source)     at org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:291)     at org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:291)     at com.mendix.connectionbus.modelsynchronization.DdlCommandExecutor.executeDdlCommands(DdlCommandExecutor.java:136)     at com.mendix.connectionbus.modelsynchronization.DdlCommandExecutor.execute(DdlCommandExecutor.java:43)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.synchronizeModel(SynchronizationManager.scala:170)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.executeImpl(SynchronizationManager.scala:161)     at com.mendix.connectionbus.modelsynchronization.SynchronizationManager.execute(SynchronizationManager.scala:108)     at com.mendix.connectionbus.ConnectionBusImpl.executeDDLCommands(ConnectionBusImpl.java:392)     at com.mendix.basis.component.internal.LocalComponentImpl.executeDDLCommands(LocalComponentImpl.scala:107)     at com.mendix.basis.impl.MxRuntimeImpl.executeDDLCommands(MxRuntimeImpl.java:1009)     at com.mendix.basis.action.admin.ExecuteDDLCommandsAction.call(ExecuteDDLCommandsAction.java:26)     at com.mendix.basis.action.admin.RuntimeAdminAction.execute(RuntimeAdminAction.java:18)     at com.mendix.m2ee.appcontainer.server.handler.HttpAdminHandler.handle(HttpAdminHandler.java:129)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)     at org.eclipse.jetty.server.Server.handle(Server.java:502)     at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)     at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)     at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)     at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)     at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)     at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)     at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)     at java.lang.Thread.run(Thread.java:748)
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