Your server may not be connected to Corporate/Enterprise Ldap, but Windchill comes bundles with a local Ldap server called WindchillDS. WindchillDS holds configuration information that Windchill needs in order to even start up. Since you skipped the Ldap rehosting, Windchill isn't able to find the necessary config info in WindchillDS for its new hostname, and is crashing on startup. If you go back and follow the instructions in the rehost guide to rehost the Ldap, then Windchill should start up.
You'll also need to go back and do the updates to the repository table that you had skipped. There will be entries for your WindchillDS Ldap in the repository table that need to be updated to the new hostname.