Error occurred after upgrading to 12.0.1

Hi -- I work for a small school and we had hired a consultant to help us install webhelpdesk in the past. The consultant installed webhelpdesk in a CentOS server and we can't contact he consultant anymore since he moved out of country.

Today I tried upgrading to 12.0.1 and was able to do so on CentOS. Upon logging in to webhelpdesk, it asked me to run update database. But when I clicked "Continue", it gave me this error with stack trace info. Any help is much appreciated. Thanks.

Error

An error occurred while updating the database:

Communications link failure during rollback(). Transaction resolution unknown.

Stack Trace

Communications link failure during rollback(). Transaction resolution unknown.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:4808)

at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4403)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1594)
at com.webobjects.jdbcadaptor.JDBCContext.disconnect(JDBCContext.java:388)
at com.webobjects.jdbcadaptor.JDBCContext._channelDidClose(JDBCContext.java:521)
at com.webobjects.jdbcadaptor.JDBCChannel.closeChannel(JDBCChannel.java:158)
at com.macsdesign.util.MDSDBUpdater.updateDatabaseWithModelNamed(MDSDBUpdater.java:395)
at com.macsdesign.whd.HelpDeskDBLoader.updateDatabase(HelpDeskDBLoader.java:115)
at com.macsdesign.whd.ui.DBUpdateProgress.performAction(DBUpdateProgress.java:70)
at com.webobjects.woextensions.WOLongResponsePage.run(WOLongResponsePage.java:119)
at java.lang.Thread.run(Unknown Source)

     at com.webobjects.jdbcadaptor.JDBCContext.disconnect(JDBCContext.java:390)
     at com.webobjects.jdbcadaptor.JDBCContext._channelDidClose(JDBCContext.java:521)
     at com.webobjects.jdbcadaptor.JDBCChannel.closeChannel(JDBCChannel.java:158)
     at com.macsdesign.util.MDSDBUpdater.updateDatabaseWithModelNamed(MDSDBUpdater.java:395)
     at com.macsdesign.whd.HelpDeskDBLoader.updateDatabase(HelpDeskDBLoader.java:115)
     at com.macsdesign.whd.ui.DBUpdateProgress.performAction(DBUpdateProgress.java:70)
     at com.webobjects.woextensions.WOLongResponsePage.run(WOLongResponsePage.java:119)
     at java.lang.Thread.run(Unknown Source)

Error occurred after upgrading to 12.0.1

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