Oracle Message IMP-00020 - long column too large for column buffer size (number)

ERRORlong column too large for column buffer size (number)
CAUSEThe column buffer is too small. This usually occurs when importing LONG data.
ACTIONIncrease the insert buffer size 10,000 bytes at a time (for example). Use this step-by-step approach because a buffer size that is too large may cause a similar problem.