Oracle Message SQL*Loader-00435 - invalid constant value string for nested table column string

ERRORinvalid constant value string for nested table column string
CAUSEA constant value was specified for the SETID of a nested table column. An error occured while translating the character constant into a SETID.
ACTIONMake sure the constant string contains valid hexadecimal characters and that there are 32 hexadecimal characters.