I would like to extract from pr_link_work_tag and pr_data_social_tag (PegaDATA).

However it returns an error, "No Instance found in the database Could not process"

[MSG][Unable to process Data-Social-Tag: null][STACK][java.lang.NullPointerException at com.pega.pegarules.data.internal.dictionary.ColumnCategorizer$ColumnDecorator.decorateColumnName(ColumnCategorizer.java:1272) at com.pega.pegarules.data.internal.bix.BIXSelectClauseGenerator.getDecortaedColumnName(BIXSelectClauseGenerator.java:307) at com.pega.pegarules.data.internal.bix.BIXSelectClauseGenerator.getActualColumnName(BIXSelectClauseGenerator.java:303) at com.pega.pegarules.data.internal.bix.BIXSelectClauseGenerator.populateContentWithSelectFieldsForBlobless(BIXSelectClauseGenerator.java:250) at com.pega.pegarules.data.internal.bix.BIXSelectClauseGenerator.populateContentWithSelectFields(BIXSelectClauseGenerator.java:214) at com.pega.pegarules.data.internal.access.BIXSourceSQLGenerator.populateSelectClause(BIXSourceSQLGenerator.java:228) at com.pega.pegarules.data.internal.access.BIXSourceSQLGenerator.createSelectStatement(BIXSourceSQLGenerator.java:193) at com.pega.pegarules.data.internal.access.ExtractImpl.doExtract(ExtractImpl.java:1735) at com.pega.pegarules.data.internal.access.ExtractImpl.runExtract(ExtractImpl.java:1297) at com.pega.pegarules.data.internal.access.ExtractImpl.run(ExtractImpl.java:1130) at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1380) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1123) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:930) at com.pega.pegarules.data.internal.access.ExtractImpl.runEngineExtract(ExtractImpl.java:1113) at com.pega.pegarules.data.internal.access.DatabaseImpl.executeExtract(DatabaseImpl.java:3612) at com.pega.pegarules.session.internal.mgmt.Executable.executeExtract(Executable.java:8874) at com.pegarules.generated.activity.ra_action_runextract_c31b2b8088d1781c0f96f51842fa3c31.step1_circum0(ra_action_runextract_c31b2b8088d1781c0f96f51842fa3c31.java:176) at com.pegarules.generated.activity.ra_action_runextract_c31b2b8088d1781c0f96f51842fa3c31.perform(ra_action_runextract_c31b2b8088d1781c0f96f51842fa3c31.java:76) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:2850) at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:653) at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivities(ThreadRunner.java:580) at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivities(PRThreadImpl.java:512) at com.pega.pegarules.session.internal.async.agent.QueueProcessor.executeBatchTask(QueueProcessor.java:305) at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:361) at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:1174) at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1380) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1123) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1004) at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:831) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:750) ] 

Any help is welcome!