PAI Cube building failed with error "255:: Error occured while performing external sorting" in Servigistics Intellicus

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Build Failed
--------------------Last Build Summary--------------------
Build Type : Full
Build No : 1
Completed On : <dateTime>
Summary:
-1:: java.lang.NullPointerException
255:: Error occured while performing external sorting
204021:: Error while building CUBE.
204029:: Failed to build cube as failed to get cube object details from repository

--------------------All Build Summary--------------------
Completed On :  <dateTime>
Summary :
-1:: java.lang.NullPointerException
255::Error occured while performing external sorting
204021::Error while building CUBE.
204029::Failed to build cube as failed to get cube object details from repository
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• <datetime> <thread>  : Trying to acquire new connection object for: DemoStagingDB
  <datetime> <thread>  : DBConnPooling: Populating new batch with size = 5 for pool =
  <datetime> <thread>  : DBConnPooling: Total DB connections in all pools of container:DemoStagingDB are =30
  <datetime> <thread>  : DBConnPooling: Populating failed,expansion capacity fell short
  <datetime> <thread>  : Failed to expand the connection pool:
  <datetime> <thread>  : DBConnPooling: Populating new batch with size = 5 for pool =
  <datetime> <thread>  : DBConnPooling: Total DB connections in all pools of container:DemoStagingDB are =30
  <datetime> <thread>  : DBConnPooling: Populating failed,expansion capacity fell short
  <datetime> <thread>  : Failed to expand the connection pool:
  <datetime> <thread>  : 17918041:Unable to acquire connection. Either increase the connection Timeout settings or increase the maximum number of connections in the Pool
  com.impetus.interaj.providers.DataProviderException: 76~X~Unable to acquire connection. Either increase the connection Timeout settings or increase the maximum number of connections in the Pool
  at com.impetus.interaj.dataprovider.connection.ConnectionPool.acquireConnection(ConnectionPool.java:808) [?:?]
  at com.impetus.interaj.dataprovider.connection.DBConnectionPool.acquireConnection(DBConnectionPool.java:80) [?:?]
  at com.impetus.interaj.dataprovider.connection.ConnectionPoolContainer.acquireConnection(ConnectionPoolContainer.java:1380) [?:?]
  at com.impetus.interaj.dataprovider.connection.ConnectionManager.acquireConnection(ConnectionManager.java:4181) [?:?]
  at com.impetus.interaj.dataprovider.connection.ConnectionManager.acquireConnection(ConnectionManager.java:4211) [?:?]
  at com.impetus.interaj.dataprovider.DataSourceManager.getDSConnection(DataSourceManager.java:287) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.JDBCDataSourceManager.getDSConnection(JDBCDataSourceManager.java:936) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.JDBCDataSourceManager.executeQuery(JDBCDataSourceManager.java:1010) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.RDBMSResultSet.executeQueryOnDataSourceManager(RDBMSResultSet.java:1589) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.RDBMSResultSet.executeFinalQueryOnDataSource(RDBMSResultSet.java:1776) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.RDBMSResultSet.executeSQLQuery(RDBMSResultSet.java:1650) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.RDBMSResultSet.executeAsTable(RDBMSResultSet.java:1333) [?:?]
  at com.impetus.interaj.dataprovider.etl.BaseResultSet.executeResultSetAsProcedureOrTableOrDefault(BaseResultSet.java:2646) [?:?]
  at com.impetus.interaj.dataprovider.etl.BaseResultSet.populate(BaseResultSet.java:1332) [?:?]
  at com.impetus.interaj.dataprovider.rdbms.RDBMSResultSet.populate(RDBMSResultSet.java:3062) [?:?]
  at com.impetus.interaj.dataprovider.etl.sort.DatabaseSort.applySorting(DatabaseSort.java:167) [?:?]
  at com.impetus.interaj.dataprovider.etl.sort.SortedResultSet.applySorting(SortedResultSet.java:135) [?:?]
  at com.impetus.interaj.dataprovider.etl.sort.SortedResultSet.run(SortedResultSet.java:201) [?:?]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131]
  at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]