> For the complete documentation index, see [llms.txt](https://docs.buzzy.buzz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.buzzy.buzz/troubleshooting/app-error-codes.md). # App Error Codes App error codes appear when a running Buzzy app cannot resolve the app, screen, datatable, field, component, action, or runtime context it needs. These are runtime/app issues, not general Workspace account issues. Use this page when a previewed or published app shows an error screen, a blank runtime state, or a named app error. If the Workspace editor itself is blank or frozen, start with the [Troubleshooting Overview](/troubleshooting/troubleshooting.md) instead. ## How to Read These Errors Most app errors fall into four groups: | Group | What it usually means | Common errors | | --------------------------- | ------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | App or route errors | The URL, app, screen, or route cannot be resolved. | [App Not Found](/troubleshooting/app-error-codes/app-not-found.md), [No App Selected](/troubleshooting/app-error-codes/no-app-selected.md), [No Screens Found](/troubleshooting/app-error-codes/no-screens-found.md), [Screen Not Found](/troubleshooting/app-error-codes/screen-not-found.md), [Unknown Path Error](/troubleshooting/app-error-codes/unknown-path-error.md) | | Datatable and field errors | A screen, component, form, filter, action, or Code Widget references missing or unset data model items. | [Datatable Not Found](/troubleshooting/app-error-codes/datatable-not-found.md), [Datatable Not Set](/troubleshooting/app-error-codes/datatable-not-set.md), [Field Not Found](/troubleshooting/app-error-codes/field-not-found.md), [Field Not Set](/troubleshooting/app-error-codes/field-not-set.md) | | Component and action errors | A screen element is missing required configuration or an action target. | [Component Missing](/troubleshooting/app-error-codes/component-missing.md), [Component Not Set](/troubleshooting/app-error-codes/component-not-set.md), [Component Settings Error](/troubleshooting/app-error-codes/component-settings-error.md), [Action Error](/troubleshooting/app-error-codes/action-error.md), [Screen Not Set](/troubleshooting/app-error-codes/screen-not-set.md), [No Context Name](/troubleshooting/app-error-codes/no-context-name.md) | | Runtime exceptions | The app loaded, but something unexpected failed while executing runtime code. | [Runtime Exception](/troubleshooting/app-error-codes/runtime-exception.md) | ## Fast Triage 1. **Open the app from the Dashboard.** This rules out stale deep links and deleted screen URLs. 2. **Check what changed recently.** Renamed fields, deleted screens, regenerated data models, updated Figma publishes, or changed actions are common causes. 3. **Use in-app debugging.** In the editor, inspect the affected screen or selected node with [In-App Debugging](/troubleshooting/in-app-debugging.md). 4. **Check data context.** Detail screens, edit forms, sub-tables, and row actions often require the previous action to pass the current row. 5. **Check bindings.** Views, forms, filters, fields, buttons, and widgets must point to current datatables, fields, screens, and actions. 6. **Republish or retest.** After fixing the binding or configuration, preview the app again and rerun any relevant [Tests](/the-building-blocks/release-tests.md). ## Workspace vs Runtime | Symptom | More likely area | Where to go | | --------------------------------------------------------------------------------------- | -------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Workspace editor does not load, subscription access is wrong, or panels are unavailable | Workspace/account | [Troubleshooting Overview](/troubleshooting/troubleshooting.md) | | App URL opens but shows a named error | Runtime/app | The matching error page below | | A Figma-published app is blank or visually wrong | Figma/plugin or screen structure | [Troubleshooting Buzzy for Figma](/working-with-buzzy/buzzy-for-figma/troubleshooting-buzzy-for-figma.md) and [In-App Debugging](/troubleshooting/in-app-debugging.md) | | A generated app has wrong logic or broken bindings | AI output plus app structure | [Troubleshooting Buzzy AI](/working-with-buzzy/buzzy-ai/troubleshooting-buzzy-ai.md) and [In-App Debugging](/troubleshooting/in-app-debugging.md) | | A Code Widget, Function, REST call, or MCP tool fails | Extension/integration | [API and Extension Surfaces](/developing-and-extending-buzzy/api-and-extension-surfaces.md) | ## Error Reference * [Action Error](/troubleshooting/app-error-codes/action-error.md) * [App Not Found](/troubleshooting/app-error-codes/app-not-found.md) * [Component Missing](/troubleshooting/app-error-codes/component-missing.md) * [Component Not Set](/troubleshooting/app-error-codes/component-not-set.md) * [Component Settings Error](/troubleshooting/app-error-codes/component-settings-error.md) * [Datatable Not Found](/troubleshooting/app-error-codes/datatable-not-found.md) * [Datatable Not Set](/troubleshooting/app-error-codes/datatable-not-set.md) * [Field Not Found](/troubleshooting/app-error-codes/field-not-found.md) * [Field Not Set](/troubleshooting/app-error-codes/field-not-set.md) * [No App Selected](/troubleshooting/app-error-codes/no-app-selected.md) * [No Context Name](/troubleshooting/app-error-codes/no-context-name.md) * [No Screens Found](/troubleshooting/app-error-codes/no-screens-found.md) * [Runtime Exception](/troubleshooting/app-error-codes/runtime-exception.md) * [Screen Not Found](/troubleshooting/app-error-codes/screen-not-found.md) * [Screen Not Set](/troubleshooting/app-error-codes/screen-not-set.md) * [Unknown Path Error](/troubleshooting/app-error-codes/unknown-path-error.md)