Dear Apps DBA.
If you find RC-50409: Topology information required for cloning not found (during the cloning step) this is a solution for it
Summary
Running the preclone steps (adpreclone.pl dbTier) to create a new clone (probably from a previous clone) you get the errors:
RC-50409: Topology information required for cloning not found in the database.
Make sure that AutoConfig was run successfully prior to starting Rapid Clone, and try again
Raised by oracle.apps.ad.tools.AdCreateCtlFile
RC-50208: Exception in method gen_crctrfclone_sql
RC-50208: Exception in Constructor AdCreateCtlFile
Raised by oracle.apps.ad.tools.AdCreateCtlFile
This problem typically occurs when you try to create a new clone, from a clone created from a RAC database.
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Rc-50409: topology information required for cloning not found 2012-07-06
Rc-50409: topology information required for cloning not found