How to solve Uncaght server Exception Error ImportError: No module named www.pricing.index

raceback (most recent call last):
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/render.py”, line 45, in render
data = render_page_by_language(path)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/render.py”, line 139, in render_page_by_language
return render_page(path)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/render.py”, line 155, in render_page
return build(path)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/render.py”, line 162, in build
return build_page(path)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/render.py”, line 175, in build_page
context = get_context(path)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/context.py”, line 28, in get_context
context = build_context(context)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/context.py”, line 98, in build_context
update_controller_context(context, context.controller)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/website/context.py”, line 37, in update_controller_context
module = frappe.get_module(controller)
File “/home/amolash/Regist/frappe-bench/apps/frappe/frappe/init.py”, line 707, in get_module
return importlib.import_module(modulename)
File “/usr/lib/python2.7/importlib/init.py”, line 37, in import_module
import(name)
ImportError: No module named www.pricing.index

Did you make changes to any core files?

I cant change any core file