Restoring error

i tried to run this but it gives an error forbidden

wget http://192.168.1.1:8080/backups/20180211_123456-site1_local-files.tar

Backups are private, you need to login first and then download backup via Download backup utility.

i already downloaded my back up whats next?

Restore it!

bench --site site-name --force restore path/to/download-backup

i already done that then the bench migration then my item pictures wont show anywhere in the website and in file lis… how could i fix this…
and when i go to my website then press products it gives an error
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 39, in render
data = render_page_by_language(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 133, in render_page_by_language
return render_page(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 149, in render_page
return build(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 156, in build
return build_page(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 169, in build_page
context = get_context(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/context.py”, line 28, in get_context
context = build_context(context)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/context.py”, line 89, in build_context
ret = context.doc.get_context(context)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/item_group/item_group.py”, line 69, in get_context
limit=context.page_length + 1, search=frappe.form_dict.get(“search”)),
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/item_group/item_group.py”, line 109, in get_product_list_for_group
data = adjust_qty_for_expired_items(data)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/item_group/item_group.py”, line 121, in adjust_qty_for_expired_items
qty = stock_qty_dict.stock_qty[0][0]
IndexError: tuple index out of range