Oracle Message ORA-01792 - maximum number of columns in a table or view is 1000

ERRORmaximum number of columns in a table or view is 1000
CAUSEAn attempt was made to create a table or view with more than 1000 columns, or to add more columns to a table or view which pushes it over the maximum allowable limit of 1000. Note that unused columns in the table are counted toward the 1000 column limit.
ACTIONIf the error is a result of a CREATE command, then reduce the number of columns in the command and resubmit. If the error is a result of an ALTER TABLE command, then there are two options: 1) If the table contained unused columns, remove them by executing ALTER TABLE DROP UNUSED COLUMNS before adding new columns; 2) Reduce the number of columns in the command and resubmit.

1290097ORA-01792 while running online reorganization of the table
606395FAQ: Oracle Limitations