Receiving Error when converting a table to use partitioning

I am getting the following errors when I try converting a table to use partitioning. I converted other tables successfully in the same schema but the following is not cooperating. Any input is greatly appreciated. Original DDL for the following interim table is the same except the I omitted the index constraint and added the partitioning clause. What am I doing wrong this time? :-)

CREATE TABLE SOADEV_SOAINFRA.MEDIATOR_AUDIT_DOCUMENT_PART
   (    ID VARCHAR2(100) NOT NULL ENABLE,
        AUDIT_ID VARCHAR2(100) NOT NULL ENABLE,
        NAME VARCHAR2(1000),
        DOCUMENT BLOB,
        TYPE VARCHAR2(100),
        PAYLOAD_KEY VARCHAR2(200),
        INSTANCE_ID VARCHAR2(100),
        CASE_ID VARCHAR2(100),
        MI_PARTITION_DATE TIMESTAMP (6)