I get following error after upgrading zcs java libraries from 5.x to 6.0.5:

Code:
INFO: Starting Servlet Engine: Apache Tomcat/6.0.18
2010-02-22 21:17:59,317 [main] INFO  com.toco.integration.zimbra.ZcsService 47  init- Connecting to mail server ...
2010-02-22 21:17:59,681 [main] WARN  zimbra.misc 230  warn- local config file `/opt/zimbra/conf/localconfig.xml' is not readable
2010-02-22 21:18:02,326 [main] WARN  zimbra.account 230  warn- failed to get AttributeManager instance
com.zimbra.common.service.ServiceException: system failure: attrs directory does not exists: /opt/zimbra/conf/attrs
ExceptionId:main:1266891482323:30a050e134420e77
Code:service.FAILURE
	at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:248)
	at com.zimbra.cs.account.AttributeManager.<init>(AttributeManager.java:164)
	at com.zimbra.cs.account.AttributeManager.getInstance(AttributeManager.java:148)
	at com.zimbra.cs.account.Entry.setAttributeManager(Entry.java:79)
	at com.zimbra.cs.account.Entry.<init>(Entry.java:66)
	at com.zimbra.cs.account.NamedEntry.<init>(NamedEntry.java:41)
	at com.zimbra.cs.account.MailTarget.<init>(MailTarget.java:26)
	at com.zimbra.cs.account.ZAttrAccount.<init>(ZAttrAccount.java:32)
	at com.zimbra.cs.account.Account.<init>(Account.java:36)
	at com.zimbra.cs.account.soap.SoapAccount.<init>(SoapAccount.java:35)
	at com.zimbra.cs.account.soap.SoapProvisioning.get(SoapProvisioning.java:663)
	at com.zimbra.cs.account.soap.SoapProvisioning.getAccount(SoapProvisioning.java:647)
	at com.toco.integration.zimbra.ZcsService.newProvisioning(ZcsService.java:204)
	at com.toco.integration.zimbra.ZcsService.init(ZcsService.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
This same code worked fine until I attempted migrating from 5.x zcs java APIs to the 6.x version.

It seems like there was some major refactoring between versions.

Are there any migration docs available?

Any assistance would be appreciated.