This may be caused by: 

 

a. Because your site moved, all old users have moved with it. The user made by Savvii was possibly overwritten in the process. You can log in to WordPress with an existing account from your site.

 

b. Your mail client has merged two '-' symbols into one. This may occus in usernames, hostnames and passwords. This usually happens when your domain name contains a '-' , for example: abc-xyz.nl. You need to exchange this long dash symbol with TWO '-' with no space.