Problem adfter update to 1.6.1

[dr.NET informatica]

Hi all,

after update of my prestashop we have a lots of problems with the products page.

 

The error that we have when we enter in Products page in BO is the same

 

Notice alla linea 69 nel file /.../classes/helper/HelperTreeCategories.php
[8] Undefined variable: result

Notice alla linea 69 nel file /..../classes/helper/HelperTreeCategories.php
[8] Undefined variable: result

Warning alla linea 376 nel file /.../classes/helper/HelperTreeCategories.php
[2] array_key_exists() expects parameter 2 to be array, null given

 

If I enter in the product detail I have another problem more important problem:

 

Tab : Prices (500)
A server error occurred while loading the tabs: some tabs could not be loaded.
Please try again by refreshing the page.
If you are still encountering this problem, please check your server logs or contact your hosting provider for assistance.

 

And logically the prices tab is not visible

 

Have you ever seen a problem like that?

 

Thank's