ORA-39726 unsupported add/drop column operation on compressed tables

{ This note contains error information about an "Oracle Server"
  error number. It may contain additional support notes as
  described in Note:22080.1 }

Error:	  ORA-39726  (ORA-39726)
Text:	  unsupported add/drop column operation on compressed tables 
---------------------------------------------------------------------------
Cause:	An unsupported add/drop column operation for compressed table was 
	attemped. 
Action:	When adding a column, do not specify a default value. DROP column 
	is only supported in the form of SET UNUSED column (meta-data drop 
	column).