Error in Production Order creation

I am getting the following error while saving a Production Order. I have created the BOM and after that while creating the Production order I am getting an error.
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 62, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 53, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 939, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 81, in runserverobj
frappe.desk.form.run_method.runserverobj(method, docs=docs, dt=dt, dn=dn, arg=arg, args=args)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/run_method.py”, line 36, in runserverobj
r = doc.run_method(method)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 755, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1024, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1007, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 749, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/manufacturing/doctype/production_order/production_order.py”, line 441, in get_items_and_operations_from_bom
self.set_required_items()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/manufacturing/doctype/production_order/production_order.py”, line 477, in set_required_items
self.set_available_qty()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/manufacturing/doctype/production_order/production_order.py”, line 449, in set_available_qty
d.available_qty_at_source_warehouse = get_latest_stock_qty(d.item_code, d.source_warehouse)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/utils.py”, line 75, in get_latest_stock_qty
lft, rgt, is_group = frappe.db.get_value(“Warehouse”, warehouse, [“lft”, “rgt”, “is_group”])
TypeError: ‘NoneType’ object is not iterable

Even while entering the qty to manufacture and tabbing out I am getting this error.

Thanks in advance

Seems like source warehouse entered in some of the raw materials is not valid.

Thanks a lot. It worked.