Here is the traceback :

RPC_ERROR
Odoo Server Error
Traceback (most recent call last):
File "/home/odoo/src/odoo/16.0/odoo/http\.py",\ line\ 1578,\ in\ _serve_db
\ \ \ \ return\ service_model\.retrying\(self\._serve_ir_http,\ self\.env\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/service/model\.py",\ line\ 134,\ in\ retrying
\ \ \ \ result\ =\ func\(\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/http\.py",\ line\ 1607,\ in\ _serve_ir_http
\ \ \ \ response\ =\ self\.dispatcher\.dispatch\(rule\.endpoint,\ args\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/http\.py",\ line\ 1804,\ in\ dispatch
\ \ \ \ result\ =\ self\.request\.registry\['ir\.http'\]\._dispatch\(endpoint\)
\ \ File\ "/home/odoo/src/odoo/16\.0/addons/website/models/ir_http\.py",\ line\ 227,\ in\ _dispatch
\ \ \ \ response\ =\ super\(\)\._dispatch\(endpoint\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_http\.py",\ line\ 140,\ in\ _dispatch
\ \ \ \ result\ =\ endpoint\(\*\*request\.params\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/http\.py",\ line\ 698,\ in\ route_wrapper
\ \ \ \ result\ =\ endpoint\(self,\ \*args,\ \*\*params_ok\)
\ \ File\ "/home/odoo/src/odoo/16\.0/addons/web/controllers/dataset\.py",\ line\ 42,\ in\ call_kw
\ \ \ \ return\ self\._call_kw\(model,\ method,\ args,\ kwargs\)
\ \ File\ "/home/odoo/src/odoo/16\.0/addons/web/controllers/dataset\.py",\ line\ 33,\ in\ _call_kw
\ \ \ \ return\ call_kw\(request\.env\[model\],\ method,\ args,\ kwargs\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/api\.py",\ line\ 457,\ in\ call_kw
\ \ \ \ result\ =\ _call_kw_model\(method,\ model,\ args,\ kwargs\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/api\.py",\ line\ 430,\ in\ _call_kw_model
\ \ \ \ result\ =\ method\(recs,\ \*args,\ \*\*kwargs\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 2477,\ in\ get_views
\ \ \ \ result\['views'\]\ =\ \{
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 2478,\ in\
\ \ \ \ v_type:\ self\.get_view\(
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 2662,\ in\ get_view
\ \ \ \ result\ =\ dict\(self\._get_view_cache\(view_id,\ view_type,\ \*\*options\)\)
\ \ File\ "",\ line\ 2,\ in\ _get_view_cache
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/tools/cache\.py",\ line\ 90,\ in\ lookup
\ \ \ \ value\ =\ d\[key\]\ =\ self\.method\(\*args,\ \*\*kwargs\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 2622,\ in\ _get_view_cache
\ \ \ \ arch,\ view\ =\ self\._get_view\(view_id,\ view_type,\ \*\*options\)
\ \ File\ "/home/odoo/src/odoo/16\.0/addons/web/models/models\.py",\ line\ 241,\ in\ _get_view
\ \ \ \ arch,\ view\ =\ super\(\)\._get_view\(view_id,\ view_type,\ \*\*options\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 2569,\ in\ _get_view
\ \ \ \ arch\ =\ view\._get_combined_arch\(\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 988,\ in\ _get_combined_arch
\ \ \ \ arch\ =\ root\.with_prefetch\(tree_views\._prefetch_ids\)\._combine\(hierarchy\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 929,\ in\ _combine
\ \ \ \ combined_arch\ =\ view\.apply_inheritance_specs\(combined_arch,\ arch\)
\ \ File\ "/home/odoo/src/enterprise/16\.0/web_studio/models/ir_ui_view\.py",\ line\ 530,\ in\ apply_inheritance_specs
\ \ \ \ return\ super\(View,\ self\)\.apply_inheritance_specs\(source,\ specs_tree,
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 866,\ in\ apply_inheritance_specs
\ \ \ \ self\._raise_view_error\(str\(e\),\ specs_tree\)
\ \ File\ "/home/odoo/src/odoo/16\.0/odoo/addons/base/models/ir_ui_view\.py",\ line\ 743,\ in\ _raise_view_error
\ \ \ \ raise\ err\ from\ from_exception
ValueError:\ Element\ ''\ cannot\ be\ located\ in\ parent\ view

The\ above\ server\ error\ caused\ the\ following\ client\ error:
RPC_ERROR:\ Odoo\ Server\ Error
\ \ \ \ at\ makeErrorFromResponse\ \(https://www\.vandammehandyman\.com/web/assets/1218\-d10abd0/web\.assets_backend\.min\.js:964:163\)
\ \ \ \ at\ XMLHttpRequest\.\ \(https://www.vandammehandyman.com/web/assets/1218-d10abd0/web.assets_backend.min.js:971:13)