[ZODB-Dev] FS21 ERROR: Bad reference?

[Andrew Sydelko]

I did a pack tonight of our database and during the pack
these showed up:

2002-12-01T21:47:54 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xf8', '')

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2002-12-01T21:47:54 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xf7', '')

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2002-12-01T21:47:54 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xf6', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xfe', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xfd', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xfc', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xfb', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xfa', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xf9', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xec', '')

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2002-12-01T21:47:55 ERROR(200) ZODB FS FS21 ERROR: Bad reference to ('\x00\x00\x00\x00\x00\x18\xe4\xe6', '')

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2002-12-01T22:12:25 BLATHER(-100) ZEO Server pack end
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Any ideas what causes this?

(Zope 2.5.1, Python 2.1.3, using ZEO 1.0)

--andy.