Next.js, Material UI of refine.dev error

Hello support team, I used refine.dev with material UI and Next.js but I am getting

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `RootLayout`.

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `RootLayout`.

how to fix this issue?

2 Replies

kapa.ai•2w ago

Hi @Ghostman. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- I understand you're encountering an error when using refine with Material UI and Next.js. This error typically occurs when there's an issue with component imports or when there are compatibility problems between packages. Based on the knowledge sources, there are a few potential causes and solutions for this issue: Possible Causes and Solutions 1. MUI Icons Issue: Some users have reported that leaving instances of Material UI inferencer imports in their _app.tsx file can cause build errors. Try removing all instances of Inferencer before building your application.

   // Remove imports like this from _app.tsx
   import { MuiInferencer } from "@refinedev/inferencer/mui";

   // Remove imports like this from _app.tsx
   import { MuiInferencer } from "@refinedev/inferencer/mui";

Github Issue #3588 2. ESM Import Issues: There are known issues with Material UI packages in Remix projects that might also affect Next.js. This is related to how imports from @mui/* packages are handled. The error might be related to directory imports not being supported when resolving ES modules. This is a known issue with Material UI packages. Github Issue #6007 3. Bundle Size and Dynamic Imports: If you're importing many components in your _app.tsx, try using dynamic imports to reduce bundle size and potentially fix import issues:

   import dynamic from "next/dynamic";

   const ComponentName = dynamic(() =>
     import("../components/path/to/component").then((mod) => mod.ComponentName)
   );

   import dynamic from "next/dynamic";

   const ComponentName = dynamic(() =>
     import("../components/path/to/component").then((mod) => mod.ComponentName)
   );

Github Issue #3357 4. Check Component Exports: The error message suggests that you might have mixed up default and named imports. Make sure you're importing components correctly:

   // For named exports
   import { ThemedLayoutV2 } from "@refinedev/mui";
   
   // For default exports
   import CssBaseline from "@mui/material/CssBaseline";

   // For named exports
   import { ThemedLayoutV2 } from "@refinedev/mui";
   
   // For default exports
   import CssBaseline from "@mui/material/CssBaseline";

5. Version Compatibility: Ensure that your Material UI and refine versions are compatible. There have been issues reported with certain versions of MUI components. If you continue to face issues, you might want to check your specific implementation against the examples provided in the Material UI introduction documentation to ensure you're following the recommended patterns. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2w ago

<@1014424596260343818> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

Next.js, Material UI of refine.dev error

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