Application gives an error ORA-20901:

hello good day,
I'm having problems with one of my application pages i'm getting the following error
ORA-20901: Last updated data column "IMAGE_LAST_UPDATE" datatype "VARCHAR2" used to track updates to "INSTRUCTOR_IMAGE" must be a date datatype
Error Unable to process row of table INSTRUCTOR.
This occurs when I'm trying to add a new employee.
i really don't understand what went wrong because everything was working just fine. INSTRUCTOR_IMAGE currently has a datatype BLOB which holds a photo of an instructor.
I'm currently using APEX 3.2.1.
any form of assistance will be greatly appreciated

What is the data type for your image_last_update column? That is the one that seems to be the issue - it needs to be a date for the blob support to work properly.
-- Sharon

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Scott,
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