According to Oracle documentation:
IMP-00009: abnormal end of export file
Cause: The export file is probably from an aborted Export session.
Action: If so, retry the export and import. Otherwise, report this as an Import bug and submit the export file that caused this error to customer support.
As as result, a corrupted export file is rather possible. However, if a corrupted export file is not the case then according to:
IMP-00020: long column too large for column buffer size (number)
Cause: The column buffer is too small. This usually occurs when importing LONG data.
Action: Increase 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.
You could try increasing the buffer size 10000 bytes a a time, because as the documentation says, too long bugger size can cause the same message.