Thank you for your help. I have been feeling very stuck and would really like
to be able to use geowebcache.
I added -Xmx512m -XX:MaxPermSize=256m to my geoserver-2.1.2/bin/startup.sh
and 
I substituted the gridSet you supplied (it complained until I moved the
metersPerUnit after scaleDenominators) 

I still get what appears to me to be the same message and geoserver doesn't
work:

2011-10-27 07:55:19,024 INFO [gwc.config] - Initializing GeoServer specific
GWC configuration from gwc-gs.xml
2011-10-27 07:55:21,800 INFO [storage.DefaultStorageFinder] -
********************************************************************************************************************************
2011-10-27 07:55:21,801 INFO [storage.DefaultStorageFinder] - *** Found Java
environment variable GEOSERVER_DATA_DIR set to
/opt/geoserver-2.1.2/data_dir, using it as the default prefix. ***
2011-10-27 07:55:21,801 INFO [storage.DefaultStorageFinder] -
********************************************************************************************************************************
2011-10-27 07:55:22,631 INFO [jdbc.JDBCMBWrapper] - MetaStore database is
version 120
2011-10-27 07:55:22,727 INFO [config.XMLConfiguration] - Found configuration
file in /opt/geoserver-2.1.2/data_dir/gwc
2011-10-27 07:55:23,186 INFO [config.XMLConfiguration] - Configuration file
validated fine.
2011-10-27 07:55:23,246 INFO [storage.StorageBroker] - Destroying
StorageBroker
2011-10-27 07:55:24,523 INFO [geoserver.catalog] - Disposing datastore
'DataStoreInfoImpl--570ae188:124761b8d78:-7fd9'
2011-10-27 07:55:24,524 INFO [geoserver.catalog] - Disposing datastore
'DataStoreInfoImpl--570ae188:124761b8d78:-7fdc'
2011-10-27 07:55:24,527 ERROR [context.ContextLoader] - Context
initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'GWCCapabilitiesHomePageProvider' defined in URL
[jar:file:/opt/geoserver-2.1.2/webapps/geoserver/WEB-INF/lib/web-gwc-2.1.2.jar!/applicationContext.xml]:
Cannot resolve reference to bean 'gwcFacade' while setting constructor
argument; nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'gwcFacade' defined in URL
[jar:file:/opt/geoserver-2.1.2/webapps/geoserver/WEB-INF/lib/gwc-2.1.2.jar!/geowebcache-geoserver-context.xml]:
Cannot resolve reference to bean 'gwcTLDispatcher' while setting constructor
argument; nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'gwcTLDispatcher' defined in URL
[jar:file:/opt/geoserver-2.1.2/webapps/geoserver/WEB-INF/lib/gwc-2.1.2.jar!/geowebcache-core-context.xml]:
Instantiation of bean failed; nested exception is
org.springframework.beans.BeanInstantiationException: Could not instantiate
bean class [org.geowebcache.layer.TileLayerDispatcher]: Constructor threw
exception; nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'gwcXmlConfig' defined in URL
[jar:file:/opt/geoserver-2.1.2/webapps/geoserver/WEB-INF/lib/gwc-2.1.2.jar!/geowebcache-core-context.xml]:
Instantiation of bean failed; nested exception is
org.springframework.beans.BeanInstantiationException: Could not instantiate
bean class [org.geowebcache.config.XMLConfiguration]: Constructor threw
exception; nested exception is
com.thoughtworks.xstream.converters.ConversionException: Cannot construct
org.geowebcache.grid.SRS as it does not have a no-args constructor : Cannot
construct org.geowebcache.grid.SRS as it does not have a no-args constructor
---- Debugging information ----
message             : Cannot construct org.geowebcache.grid.SRS as it does
not have a no-args constructor
cause-exception     :
com.thoughtworks.xstream.converters.reflection.ObjectAccessException
cause-message       : Cannot construct org.geowebcache.grid.SRS as it does
not have a no-args constructor
class               : org.geowebcache.config.GeoWebCacheConfiguration
required-type       : org.geowebcache.grid.SRS
-------------------------------

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