I am getting an error while exporting a user in Oracle 7.3.2

After exporting about 50 tables sucessfully, it complains on one table --

EXP-00015: error on 18888456 of table KEYEVT, column ACTEVTCD, datatype 96
EXP-00001: data field truncation - column length = 2, buffer sixe = 2 actual size =193
EXP-00034 : error on rowid: file# 0 block# 0 slot# 0

After that the Export continues with the next table.

I will appreciate any input on this.

- Rajeev