MySQL 5.0 Upgrade fails when upgrading from 2.6.3 to 2.7.1

2011-09-20 08:05:27,708 ERROR [ThreadPool1 ] fisheye.app DBEditHelper-doGet - Database migration failed: com.cenqua.crucible.hibernate.CruDBException: Problem with constraints script /opt/fecru-2.7.3/sql/MYSQL/schema/constraints_75.sql
com.cenqua.crucible.hibernate.CruDBException: Problem with constraints script /opt/fecru-2.7.3/sql/MYSQL/schema/constraints_75.sql
        at com.cenqua.crucible.hibernate.DefaultDBControl.addConstraints(DefaultDBControl.java:317)
        at com.atlassian.crucible.migration.item.DBImporter.importData(DBImporter.java:159)
        at com.atlassian.crucible.actions.admin.database.DBEditHelper$ImportRunner.call(DBEditHelper.java:91)
        at com.atlassian.crucible.actions.admin.database.DBEditHelper$ImportRunner.call(DBEditHelper.java:73)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: com.cenqua.crucible.hibernate.CruDBException: SQL script error on line 103: "alter table cru_review add index FK6288A3D17492E860 (cru_parent_review), add constraint FK6288A3D17492E860 foreign key (cru_parent_review) references cru_review (cru_review_id);" 
(Can't create table './fecru27/#sql-7e4e_3f7e3a.frm' (errno: 150)), please contact http://www.atlassian.com/support/
        at com.cenqua.crucible.hibernate.DefaultDBControl.executeScript(DefaultDBControl.java:483)
        at com.cenqua.crucible.hibernate.DefaultDBControl.executeScript(DefaultDBControl.java:414)
        at com.cenqua.crucible.hibernate.DefaultDBControl.addConstraints(DefaultDBControl.java:311)
        ... 10 more
Caused by: java.sql.SQLException: Can't create table './fecru27/#sql-7e4e_3f7e3a.frm' (errno: 150)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3558)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3490)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2642)
        at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1647)
        at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1566)
        at com.cenqua.crucible.hibernate.DefaultDBControl.executeScript(DefaultDBControl.java:455)
        ... 12 more