-25202: Invalid length specification for REAL field; possible lengths are 4 or 8 bytes (8 or 16 bytes if hexadecimal)  

Explanation:

The command to upload or download data contains an error.

A file field of type REAL is specified in an explicit column description. However, the length of the field does not match the length specified in the error message.

User Action:

Correct the file field type and re-execute the command.