What is wrong with my SQL here 1089 - Incorrect prefix key

Linear Secret Sharing Schemes from Error Correcting Codes and error 1089 สร้างตาราง ใน MySQL แล้ว Error SQL #1089 error 1089 Error 1089: Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique

error_ draggable element must have an item slot Oracle Lite - Version 1 to 0 : How to avoif error ORA-1089 immediate shutdown in progress in