One possible reason why the system throws this error message is that a chevron sign "<" or ">" is incorporated in the <MEMO> or <NAME> line or row on the OFX file. For OFX/QFX files, chevron sign is used as a file code and considered as a delimiter by the system.
To be able to import the OFX/QFX file, chevron sign/s should be removed.
To illustrate:
From:
<MEMO> Purchase Msft *<e02008rsy9
<NAME>Purchase Msft *<e02008rsy9
To:
<MEMO> Purchase Msft *e02008rsy9
<NAME>Purchase Msft *e02008rsy9
After updating the file, save it and re-import again. Considering there are no other issues with the file, no error should be encountered anymore.