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errors/invalid-server-options.mdx
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Delba de Oliveira
docs: Migrate error messages to MDX and App Router. (#52038)
05 июл 2023, 16:11
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05 июл 2023, 16:11
44d1a1c
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--- title: It looks like the next instance is being instantiated incorrectly. --- ## Why This Error Occurred You have passed a null or undefined parameter to the `next()` call. ## Possible Ways to Fix It Make sure you are passing the variables properly: ```js filename="server.js" const app = next() ``` And make sure you're passing dev as shown in the examples below: ```js filename="server.js" const app = next({ dev: boolean }) ``` ## Useful Links - [custom-server-express](https://github.com/vercel/next.js/blob/6ca00bfe312c8d3fc5c20d25a9cd8d2741a29332/examples/custom-server-express/server.js#L6) - [custom-server](https://github.com/vercel/next.js/blob/6ca00bfe312c8d3fc5c20d25a9cd8d2741a29332/examples/custom-server/server.js#L6) - [custom-server-typescript](https://github.com/vercel/next.js/blob/6ca00bfe312c8d3fc5c20d25a9cd8d2741a29332/examples/custom-server-typescript/server/index.ts#L7)