6. Troubleshooting

Symptom	What to check
module "EUI" is not installed	Does the import path point to the parent of the complete EUI/ directory? Is qmldir present?
Plugin loading fails or a DLL is missing	Match Qt version, architecture, compiler, and Debug/Release; check that plugin dependencies and the Qt runtime are available
Theme or utilities are missing after copying QML	Copy the complete generated module, including the compiled plugin
cl, ninja, or Qt cannot be found	Use Developer PowerShell, check PATH, and correct CMAKE_PREFIX_PATH
Changing a table/tree array does not refresh the UI	Assign a new model array instead of mutating a plain JavaScript array in place
Business text does not change with the language	ELocale manages built-in text; add your own localization bindings for business text / label
Selected files are not uploaded	Selection does not send files by default; configure action and call an upload method or enable autoUpload
EECharts reports an unsupported software backend	Remove QT_QUICK_BACKEND=software, then check host initialization, graphics, and WebEngine modules
Brand icons or video do not display	Check the SVG plugin or Multimedia backend and supported media formats