AD export cd-error

Hi, 

I have a cd-error when I run an export on AD Management Agent 

The message error is "Unable to update the password. The value provided for the new password does not meet the length, complexity, or history requirements of the domain." 

On the export changes there is an update of the useraccountcontrol 514 -> 512. 

I don't know why I have this problem ? 

Any idea to fix it. 

Thanks