sql - Why does this 'modify table' statement fail? -

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I am trying to add a 'no blank' barrier in a column in Oracle 9. 

  Modify ALTER TABLE user_roles group_id varchar2 (36 characters) Set no; However, operation fails with a strange error:  
  Error Report: SQL Error: ORA-12987: Drop Column with Other Functions Can not add 12987 00000 - "Can not combine drop columns with other tasks" * Reason: Attempted to combine the drop column with other optional tab operations was attempted. * Task: Make sure that the drop column is the only operation specified in ALTER TABLE.   > 
 Remove  set : 
 
  modify ALTER TABLE user_roles group_id varchar2 (36 characters) zero  
 
 And yes, the errors of  Oracle  can be very confusing.

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