Migration 4.0

[BlackRain44]

Hello,

 

Sorry for my bad english, I'm French.
Today, I want to update my community.
 

A moment, the installation say : Your community suite data or database configuration is saved in an encoding other than UTF-8. Before your site can be upgraded to the 4.0.0 Community Suite, we must convert the encoding to UTF-8.

So I use the converter an I have this message.

Error: Cannot delete or update a parent row: a foreign key constraint fails File: /system/Db/Db.php Line: 171

What can I do ?

 

Thank you,

Michael.