Error map
Duplicate attribute (Vue template) Vue: [plugin:vite:vue] Duplicate attribute. / [vue/no-duplicate-attributes] Duplicate attribute 'class'
Vue · layer 1, On your device
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
Vue: [Vue warn]: Property "x" was accessed during render but is not defined on instance
The template references a variable/function that the component doesn’t expose.
Vue: [plugin:vite:vue] v-else/v-else-if has no adjacent v-if or v-else-if.
A `v-else` element isn't directly after a `v-if`/`v-else-if` sibling.
Vue: [Vue warn]: Failed to locate Teleport target with selector "#modal". Note the target element must exist before the component is mounted
`` can't find its target element when mounting.
Vue: [vue/no-use-v-if-with-v-for] / Vue 3: v-if has higher priority than v-for — property accessed during render is undefined
Using `v-if` and `v-for` on one element: in Vue 3, `v-if` runs first and can't see the loop variable.
Vue: [Vue warn]: Template compilation error: Tags with side effect (<script> and <style>) are ignored in client component templates
A component template contains ``/`` tags, which Vue won't render.
Vue: TypeError: Failed to fetch dynamically imported module: https://app.example.com/assets/Settings-abc123.js
A lazy-loaded route/component chunk couldn't be loaded (new deployment removed old chunks, network issue, or wrong base path).
Vue: [plugin:vite:vue] Element is missing end tag. / Invalid end tag.
The template has unbalanced HTML tags.
Vite/Vue: [plugin:vite:import-analysis] Failed to parse source for import analysis — you may need to install appropriate plugins to handle the .vue file format
Vite can't process `.vue` files because the Vue plugin isn't installed/enabled.
Webpack: Error: [vue-loader] vue-loader was used without the corresponding plugin. Make sure to include VueLoaderPlugin in your webpack config.
Webpack config uses `vue-loader` but doesn't add its plugin.
ESLint: error Component name "Home" should always be multi-word vue/multi-word-component-names
ESLint's Vue rules require component names with at least two words to avoid clashing with HTML elements.
ESLint: Parsing error: Unexpected token < / Parsing error: '>' expected (vue-eslint-parser not configured)
ESLint can't parse `.vue` files because the Vue parser isn't configured.
TypeScript: error TS2307: Cannot find module './App.vue' or its corresponding type declarations.
TypeScript doesn't know what a `.vue` import is without a shim or Volar/`vue-tsc`.
Two steps away (33)
ReferenceError: x is not defined
Code refers to a variable or function name that doesn’t exist in the current scope.
django.template.exceptions.TemplateDoesNotExist: app/page.html
Django searched all template directories and couldn’t find that template.
Angular: NG8002: Can't bind to 'ngModel' since it isn't a known property of 'input'
The template uses a property binding that no imported directive provides — for ngModel, FormsModule isn’t imported.
TypeError: Cannot read properties of null (reading 'addEventListener')
document.querySelector/getElementById returned null, so the element doesn’t exist when the script runs.
DOMException: Failed to execute 'querySelector' on 'Document': 'x' is not a valid selector
The CSS selector string is invalid — often an ID starting with a digit or containing special characters.
ResizeObserver loop completed with undelivered notifications.
A ResizeObserver callback changed layout in a way that triggered another resize in the same frame.
Vue: [Vue warn]: Duplicate keys found during update: "5", possible duplicate or missing keys
Items in a `v-for` list share the same `:key`, which breaks Vue's diffing.
Vue: [@vue/compiler-sfc] v-model cannot be used on a prop, because local prop bindings are not writable
A template uses `v-model` on a prop (or a `v-for` alias), which can't be assigned.
Vue: [Vue warn]: <TransitionGroup> children must be keyed: <li>
Children of `` lack a unique `key`, so animations can't track items.
npm ERR! code ELIFECYCLE / Command failed with exit code 1
An npm script (build, start, test, postinstall) exited with an error. ELIFECYCLE is only the wrapper — the real error is printed…
npm ERR! Missing script: "start"
The script name you ran isn’t defined in package.json "scripts".
sh: vite: command not found (npm script)
A tool used in an npm script isn’t installed in node_modules/.bin.
Refused to execute script from 'x' because its MIME type ('text/html') is not executable
The browser fetched a script but the server labelled it text/html (usually an error page), so it refused to run it.
ChunkLoadError: Loading chunk 123 failed.
A lazily loaded JavaScript chunk couldn’t be downloaded — usually because a new deployment removed the old hashed files.
Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html"
A or dynamic import got HTML back instead of JavaScript.
SyntaxError: Unexpected token '<' (HTML served instead of JavaScript)
The browser loaded a .js file but received HTML (an error page or the SPA index.html).
SyntaxError: Unexpected end of input
The parser reached the end of the code (or JSON) while still expecting more — a missing } ) ] or empty JSON.
SyntaxError: missing ) after argument list
A function call’s parentheses are unbalanced — often an unescaped quote or a missing comma/plus.
[vite] Internal server error: Failed to resolve import "x" from "src/App.jsx". Does the file exist?
Vite couldn’t find an imported file or package.
[vite] hmr invalidate … Could not Fast Refresh. Export is incompatible.
Fast Refresh fell back to a full reload because the file exports non-components alongside components.
Vue: [Vue warn]: Extraneous non-props attributes (class) were passed to component but could not be automatically inherited because component renders fragment or text root nodes
Attributes (class, style, listeners) passed to a component can't be applied because the component has multiple root nodes.
npm ERR! code ERESOLVE — unable to resolve dependency tree
npm 7+ found conflicting peer dependency requirements and refuses to install a broken tree.
Vue: [Vue warn]: Hydration text content mismatch / Hydration node mismatch: server rendered element contains more child nodes than client vdom
Server-rendered HTML differs from what the client renders on first load.
Vue: [Vue warn]: Unhandled error during execution of mounted hook / TypeError: Cannot read properties of undefined (reading 'x')
An exception was thrown inside a lifecycle hook, watcher, event handler or render, and Vue logs it with the context.
React Hook useEffect has a missing dependency (react-hooks/exhaustive-deps)
ESLint warns that the effect reads a value that isn’t in its dependency array, so it may use a stale value.
Vue: [Vue warn]: Failed to resolve component: x
The template uses a component tag that isn’t registered or imported where it’s used.
Next.js: Failed to compile. ./src/app/page.tsx 12:7 Error: 'x' is assigned a value but never used. @typescript-eslint/no-unused-vars
`next build` runs ESLint and fails the build on lint errors.
TypeScript: error TS1005: ';' expected.
The parser hit a syntax error — missing punctuation, mismatched brackets, or an unsupported syntax for your TypeScript version.
Vue: [Vue warn]: Component emitted event "update" but it is neither declared in the emits option nor as an "onUpdate" prop
A component calls `emit("update")` without declaring it in `emits`.
Vue: [Vue warn]: onMounted is called when there is no active component instance to be associated with
A lifecycle hook was registered outside `setup()` (or after an `await`).
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"
Node tried to run a TypeScript file as ESM without a TypeScript loader.
TS2307: Cannot find module 'x' or its corresponding type declarations.
TypeScript can’t resolve the import — the package isn’t installed, the path alias isn’t configured, or there are no types.
TS7016: Could not find a declaration file for module 'x'. 'x.js' implicitly has an 'any' type.
The JavaScript package has no TypeScript types bundled and no @types package installed.
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Popular: 500403400ORA-009331064Critical errorFileNotFoundException assemblyTypeError