I'm just putting this out in the wild because I've just spent a good few hours banging my head against a wall! If you're using Spring.net for dependency injection, and you're getting an error similar to the following:
"Unable to locate Spring NamespaceHandler for XML schema namespace "
Note the empty brackets - make sure you've got a correct namespace on your Spring.Net configuration! Just to recap, your web.config / app.config should have the following custom configuration section, specifically including the bit in bold. This namespace appears to be hardcoded into the Spring.Core assembly source as a trigger for "good" behaviour:
<resource uri="config://spring/objects" />
Take care all,