Can't create a new order for a customer from Backend

by Umer Z   Last Updated November 24, 2017 23:09 PM

I can't create a new order for any customer. When I select a product and click on "Add selected products to the order" nothing happens.

And I found an error at Total Order section which is in yellow and says this: "Fatal error: Call to a member function setTotals() on a non-object in /home/.../public_html/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create/Totals.php on line 77:

Here's a photo of it:

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