Import error on doctype

[ajiragroup]

I am trying to create a new doctype (in Developer mode) but I am getting “Import error” when saving the doctype. Also, same error appears when trying to save the form.
App Versions

{
"erpnext": "15.20.6",
"frappe": "15.23.0",
"insights": "1.1.3",
"wiki": "2.0.0"
}

Route

Form/DocType/Design

Traceback

Traceback (most recent call last):
File "apps/frappe/frappe/app.py", line 110, in application
response = frappe.api.handle(request)
File "apps/frappe/frappe/api/init.py", line 49, in handle
data = endpoint(**arguments)
File "apps/frappe/frappe/api/v1.py", line 36, in handle_rpc_call
return frappe.handler.handle()
File "apps/frappe/frappe/handler.py", line 49, in handle
data = execute_cmd(cmd)
File "apps/frappe/frappe/handler.py", line 85, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File "apps/frappe/frappe/init.py", line 1718, in call
return fn(*args, **newargs)
File "apps/frappe/frappe/utils/typing_validations.py", line 31, in wrapper
return func(*args, **kwargs)
File "apps/frappe/frappe/desk/form/save.py", line 39, in savedocs
doc.save()
File "apps/frappe/frappe/model/document.py", line 337, in save
return self._save(*args, **kwargs)
File "apps/frappe/frappe/model/document.py", line 390, in _save
self.run_post_save_methods()
File "apps/frappe/frappe/model/document.py", line 1128, in run_post_save_methods
self.run_method("on_update")
File "apps/frappe/frappe/model/document.py", line 962, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File "apps/frappe/frappe/model/document.py", line 1322, in composer
return composed(self, method, *args, **kwargs)
File "apps/frappe/frappe/model/document.py", line 1304, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File "apps/frappe/frappe/model/document.py", line 959, in fn
return method_object(*args, **kwargs)
File "apps/frappe/frappe/core/doctype/doctype/doctype.py", line 526, in on_update
self.export_types_to_controller()
File "apps/frappe/frappe/core/doctype/doctype/doctype.py", line 860, in export_types_to_controller
TypeExporter(self).export_types()
File "apps/frappe/frappe/types/exporter.py", line 62, in init
self.controller_path = Path(inspect.getfile(get_controller(self.doctype)))
File "apps/frappe/frappe/model/base_document.py", line 70, in get_controller
site_controllers[doctype] = import_controller(doctype)
File "apps/frappe/frappe/model/base_document.py", line 100, in import_controller
raise ImportError(
ImportError: Design

Request Data

{
"type": "POST",
"args": {
"doc": "{"name":"Design","creation":"2024-04-25 12:21:56.815500","modified":"2024-04-25 12:33:48.227034","modified_by":"Administrator","owner":"Administrator","docstatus":0,"idx":0,"issingle":0,"is_tree":0,"istable":0,"editable_grid":0,"track_changes":0,"module":"Designs","naming_rule":"","sort_field":"modified","sort_order":"DESC","read_only":0,"in_create":0,"allow_copy":0,"allow_rename":1,"allow_import":0,"hide_toolbar":0,"track_seen":0,"max_attachments":0,"document_type":"","engine":"InnoDB","is_submittable":1,"show_name_in_global_search":0,"custom":0,"beta":0,"has_web_view":0,"allow_guest_to_view":0,"email_append_to":0,"show_title_field_in_link":0,"translated_doctype":0,"is_calendar_and_gantt":0,"quick_entry":0,"track_views":0,"is_virtual":0,"queue_in_background":0,"allow_events_in_timeline":0,"allow_auto_repeat":0,"make_attachments_public":0,"force_re_route_to_default_view":0,"show_preview_popup":0,"index_web_pages_for_search":1,"doctype":"DocType","permissions":[{"name":"a36e28bd05","creation":"2024-04-25 12:21:56.815500","modified":"2024-04-25 12:33:48.227034","modified_by":"Administrator","owner":"Administrator","docstatus":0,"parent":"Design","parentfield":"permissions","parenttype":"DocType","idx":1,"permlevel":0,"role":"System Manager","read":1,"write":1,"create":1,"submit":1,"cancel":0,"delete":1,"amend":0,"report":1,"export":1,"import":0,"share":1,"print":1,"email":1,"if_owner":0,"select":0,"doctype":"DocPerm"}],"fields":[{"docstatus":0,"doctype":"DocField","name":"new-docfield-tjbjaxwcgf","__islocal":1,"__unsaved":1,"owner":"Administrator","fieldtype":"Section Break","precision":"","non_negative":0,"hide_days":0,"hide_seconds":0,"reqd":0,"is_virtual":0,"search_index":0,"sort_options":0,"show_dashboard":0,"fetch_if_empty":0,"hidden":0,"bold":0,"allow_in_quick_entry":0,"translatable":0,"print_hide":0,"print_hide_if_no_value":0,"report_hide":0,"collapsible":0,"hide_border":0,"in_list_view":0,"in_standard_filter":0,"in_preview":0,"in_filter":0,"in_global_search":0,"read_only":0,"allow_on_submit":0,"ignore_user_permissions":0,"allow_bulk_edit":0,"permlevel":0,"ignore_xss_filter":0,"unique":0,"no_copy":0,"set_only_once":0,"remember_last_selected_value":0,"parent":"Design","parentfield":"fields","parenttype":"DocType","idx":1,"fieldname":"section_break_kjnh","show_preview_popup":0,"columns":0,"length":0},{"docstatus":0,"doctype":"DocField","name":"new-docfield-dcnmburfnc","__islocal":1,"__unsaved":1,"owner":"Administrator","fieldtype":"Select","precision":"","non_negative":0,"hide_days":0,"hide_seconds":0,"reqd":0,"is_virtual":0,"search_index":0,"sort_options":0,"show_dashboard":0,"fetch_if_empty":0,"hidden":0,"bold":0,"allow_in_quick_entry":0,"translatable":0,"print_hide":0,"print_hide_if_no_value":0,"report_hide":0,"collapsible":0,"hide_border":0,"in_list_view":0,"in_standard_filter":0,"in_preview":0,"in_filter":0,"in_global_search":0,"read_only":0,"allow_on_submit":0,"ignore_user_permissions":0,"allow_bulk_edit":0,"permlevel":0,"ignore_xss_filter":0,"unique":0,"no_copy":0,"set_only_once":0,"remember_last_selected_value":0,"parent":"Design","parentfield":"fields","parenttype":"DocType","idx":2,"__run_link_triggers":1,"fieldname":"series","label":"Series","options":"DE-.YY.###"},{"docstatus":0,"doctype":"DocField","name":"new-docfield-rsthwwtsie","__islocal":1,"__unsaved":1,"owner":"Administrator","fieldtype":"Section Break","precision":"","non_negative":0,"hide_days":0,"hide_seconds":0,"reqd":0,"is_virtual":0,"search_index":0,"sort_options":0,"show_dashboard":0,"fetch_if_empty":0,"hidden":0,"bold":0,"allow_in_quick_entry":0,"translatable":0,"print_hide":0,"print_hide_if_no_value":0,"report_hide":0,"collapsible":0,"hide_border":0,"in_list_view":0,"in_standard_filter":0,"in_preview":0,"in_filter":0,"in_global_search":0,"read_only":0,"allow_on_submit":0,"ignore_user_permissions":0,"allow_bulk_edit":0,"permlevel":0,"ignore_xss_filter":0,"unique":0,"no_copy":0,"set_only_once":0,"remember_last_selected_value":0,"parent":"Design","parentfield":"fields","parenttype":"DocType","idx":3,"__run_link_triggers":1,"fieldname":"section_break_emvt","label":""},{"docstatus":0,"doctype":"DocField","name":"new-docfield-xvntfipagv","__islocal":1,"__unsaved":1,"owner":"Administrator","fieldtype":"Link","precision":"","non_negative":0,"hide_days":0,"hide_seconds":0,"reqd":0,"is_virtual":0,"search_index":1,"sort_options":0,"show_dashboard":0,"fetch_if_empty":0,"hidden":0,"bold":0,"allow_in_quick_entry":0,"translatable":0,"print_hide":1,"print_hide_if_no_value":0,"report_hide":0,"collapsible":0,"hide_border":0,"in_list_view":0,"in_standard_filter":0,"in_preview":0,"in_filter":0,"in_global_search":0,"read_only":1,"allow_on_submit":0,"ignore_user_permissions":0,"allow_bulk_edit":0,"permlevel":0,"ignore_xss_filter":0,"unique":0,"no_copy":1,"set_only_once":0,"remember_last_selected_value":0,"parent":"Design","parentfield":"fields","parenttype":"DocType","idx":4,"fieldname":"amended_from","label":"Amended From","options":"Design","show_preview_popup":0,"columns":0,"length":0}],"actions":[],"states":[],"links":[],"__unsaved":1}",
"action": "Save"
},
"btn": {
"jQuery370096819266448346531": {
"events": {
"click": [
{
"type": "click",
"origType": "click",
"guid": 837,
"namespace": ""
}
]
}
}
},
"freeze": true,
"headers": {},
"error_handlers": {},
"url": "/api/method/frappe.desk.form.save.savedocs",
"request_id": null
}

Response Data

{
"exception": "ImportError: Design",
"exc_type": "ImportError"
}