File system error RSEF1002E (again)

I had a problem with this months ago, but it's now reappeared.  I searched 
the archive and I didn't see anything relevant. 

When attempting to open a file from our production source, I'm receiving 
the following error dialog.  (Our authorities have been changed recently, 
but my group profile has use authority to the source file.)

"RSEF1002E: Operation failed.  File system input or output error."

The '.log' file shows the following:

!ENTRY com.ibm.etools.systems.core 4 0 Mar 16, 2005 13:26:07.661
!MESSAGE EVFF1015E
!ENTRY com.ibm.etools.systems.core 4 0 Mar 16, 2005 13:26:20.411
!MESSAGE Error when opening member
!STACK 0
java.lang.reflect.InvocationTargetException: java.lang.ClassCastException: 
com/ibm/etools/iseries/core/api/ISeriesObject incompatible with 
com/ibm/etools/iseries/core/api/ISeriesFile
        at java.lang.Throwable.<init>(Throwable.java)
        at java.lang.Throwable.<init>(Throwable.java)
        at java.lang.ClassCastException.<init>(ClassCastException.java:56)
        at 
com.ibm.etools.iseries.core.api.ISeriesMember.getISeriesFile(Unknown 
Source)
        at 
com.ibm.etools.iseries.core.resources.ISeriesEditableSrcPhysicalFileMember.setRecordFormat(Unknown
 
Source)
        at 
com.ibm.etools.iseries.core.resources.ISeriesEditableSrcPhysicalFileMember.prepareLocalFile(Unknown
 
Source)
        at 
com.ibm.etools.iseries.core.resources.ISeriesEditableSrcPhysicalFileMember.doDownload(Unknown
 
Source)
        at 
com.ibm.etools.iseries.core.resources.ISeriesEditableSrcPhysicalFileMember.download(Unknown
 
Source)
        at 
com.ibm.etools.iseries.core.resources.InternalDownloadMemberRunnable.run(Unknown
 
Source)
        at 
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
!ENTRY com.ibm.etools.systems.core 4 0 Mar 16, 2005 13:26:20.427
!MESSAGE RSEF1002E: SUB#0:com/ibm/etools/iseries/core/api/ISeriesObject 
incompatible with com/ibm/etools/iseries/core/api/ISeriesFile

Does anyone know what's up?

Thanks in advance for any help,
Michael Quigley
AS/400 Programming Coordinator
The Way International
www.TheWay.org