I'm getting ORA-01406: fetched column value was truncated error during full export.

full=y
direct=y
file=Full1226.dmp
log=Full1226.log
feedback=5000
buffer=50000000



Export: Release 8.1.7.2.0 - Production on Wed Dec 26 13:49:24 2001

(c) Copyright 2000 Oracle Corporation. All rights reserved.


Username: sys
Password:

Connected to: Oracle8i Enterprise Edition Release 8.1.7.2.0 - Production
With the Partitioning option
JServer Release 8.1.7.2.0 - Production
Export done in US7ASCII character set and US7ASCII NCHAR character set

About to export the entire database ...
. exporting tablespace definitions
. exporting profiles
. exporting user definitions
. exporting roles
. exporting resource costs
. exporting rollback segment definitions
. exporting database links
. exporting sequence numbers
. exporting directory aliases
. exporting context namespaces
. exporting foreign function library names
. exporting object type definitions
EXP-00008: ORACLE error 1406 encountered
ORA-01406: fetched column value was truncated
EXP-00000: Export terminated unsuccessfully


What did I do wrong here?
This is on 8.1.7 and Solaris 7