I'm getting this error when I try to create a new account.  Any ideas as to what might be broken that I could take a look at?

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Unhandled exception: Cluster host authentication failure for Local server: authentication failed in /usr/local/centovacast/system/class_RPCDaemonClient.php:897

#0 /usr/local/centovacast/system/class_RPCDaemonClient.php(897): RPCDaemonClient::send()
#1 /usr/local/centovacast/system/class_RPCDaemonClient.php(849): RPCDaemonClient->send()
#2 /usr/local/centovacast/system/class_RPCDaemonClient.php(750): RPCDaemonClient->command()
#3 /usr/local/centovacast/system/class_GenericDaemonClient.php(127): RPCDaemonClient->remove_quota()
#4 /usr/local/centovacast/system/class_SystemControl.php(977): GenericDaemonClient::factory()
#5 /usr/local/centovacast/system/class_SystemControl.php(313): SystemControl->api_provision()
#6 /usr/local/centovacast/web/class_AccountEditor.php(875): SystemControl->__call('provision', Array)
#7 /usr/local/centovacast/web/class_AccountEditor.php(265): AccountEditor->provision_account()
#8 /usr/local/centovacast/web/reseller/modules/class_Module_accounts_base.php(65): AccountEditor->create()
#9 /usr/local/centovacast/web/admin/modules/class_Module_accounts.php(47): Module_accounts_base->create_account()
#10 /usr/local/centovacast/web/class_WebApplication.php(215): Module_accounts->execute()
#11 /usr/local/centovacast/web/admin/class_AdminApplication.php(64): WebApplication->execute()
#12 /usr/local/centovacast/web/admin/index.php(49): AdminApplication->execute()
#13 {main}

Never mind, I know what the problem is now - it's a license key issue which I might well be able to fix on my own by reissuing my license.