Can't login to BO after update

[GiveGreen]

Hey,

 

I've updated my Prestashop from version 1.6.0.14 (installed with HostGator's Quickinstaller) to the latest stable version with 1-click updater. After this update I am however unable to login to the BO.

 

It's a new webshop and I have done the steps mentioned above 3 times now, every time with the same result. 

 

I've googled a lot and some solutions came up but they all didn't work.

 

I have:

- cleaned my cache, cookies, history

- tried to login from different computers

- cleaned the smarty cache

 

Does anyone maybe know any other solutions?

 

Also in my error log i get these two errors:

 

[19-Oct-2016 13:56:10 US/Central] PHP Warning:  mcrypt_decrypt(): Received initialization vector of size 12, but size 16 is required for this encryption mode in /home3/givegreen/public_html/classes/Rijndael.php on line 68
[19-Oct-2016 13:56:10 US/Central] PHP Warning:  mcrypt_encrypt(): Received initialization vector of size 12, but size 16 is required for this encryption mode in /home3/givegreen/public_html/classes/Rijndael.php on line 51 

 

Thanks in advance.

 

Thomas 

 

(p.s. English is not my native language)