Exchange 2010 SP1 update fails (Cannot bind argument to parameter 'Identity' because it is null.)

When I attempted to upgrade my Exchange 2010 box to SP1, the Mailbox role fails to install. I am using an administrator account with all relevent permissions and groups.  I've tried the procedure to remove white space from my public folder names but this did not help.   The error message is below.  Any help would be appreciated.

Mailbox Role
Failed

Error:
The following error was generated when "$error.Clear(); if ($RoleCreatePublicFolderDatabase) { $publicDB = get-PublicFolderDatabase -Server:$RoleFqdnOrName -ErrorAction SilentlyContinue; $DB = get-MailboxDatabase -Server:$RoleFqdnOrName -ErrorAction SilentlyContinue; if ($publicDB -and $DB) { set-mailboxdatabase -Identity:$DB.Identity -publicFolderDatabase:$publicDB.Identity -DomainController $RoleDomainController } }" was run: "Cannot bind argument to parameter 'Identity' because it is null.".

Cannot bind argument to parameter 'Identity' because it is null.