Traceback (most recent call last):
  File "apps/frappe/frappe/handler.py", line 75, in execute_cmd
    method = get_attr(cmd)
  File "apps/frappe/frappe/handler.py", line 261, in get_attr
    method = frappe.get_attr(cmd)
  File "apps/frappe/frappe/__init__.py", line 1577, in get_attr
    throw(_("App {0} is not installed").format(app_name), AppNotInstalledError)
  File "apps/frappe/frappe/__init__.py", line 523, in throw
    msgprint(
  File "apps/frappe/frappe/__init__.py", line 491, in msgprint
    _raise_exception()
  File "apps/frappe/frappe/__init__.py", line 440, in _raise_exception
    raise raise_exception(msg)
frappe.exceptions.AppNotInstalledError: App webnotes is not installed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "apps/frappe/frappe/app.py", line 50, in application
    response = frappe.handler.handle()
  File "apps/frappe/frappe/handler.py", line 48, in handle
    data = execute_cmd(cmd)
  File "apps/frappe/frappe/handler.py", line 77, in execute_cmd
    frappe.throw(_("Failed to get method for command {0} with {1}").format(cmd, e))
  File "apps/frappe/frappe/__init__.py", line 523, in throw
    msgprint(
  File "apps/frappe/frappe/__init__.py", line 491, in msgprint
    _raise_exception()
  File "apps/frappe/frappe/__init__.py", line 440, in _raise_exception
    raise raise_exception(msg)
frappe.exceptions.ValidationError: Failed to get method for command webnotes.utils.email_lib.bulk.unsubscribe with App webnotes is not installed