I was following along chapter 15 on adding authentication in the app router tutorial but getting an error, that I could not figure out:

Error: Cannot find the middleware module

Call Stack 12

DevServer.runMiddleware
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/next-server.ts (1602:15)
async DevServer.runMiddleware
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/dev/next-dev-server.ts (383:22)
async NextNodeServer.handleCatchallMiddlewareRequest
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/next-server.ts (1716:16)
async DevServer.handleRequestImpl
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/base-server.ts (1545:20)
async
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/dev/next-dev-server.ts (512:14)
async Span.traceAsyncFn
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/trace/trace.ts (143:14)
async DevServer.handleRequest
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/dev/next-dev-server.ts (510:20)
async handleRoute
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/lib/router-utils/resolve-routes.ts (503:17)
async resolveRoutes
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/lib/router-utils/resolve-routes.ts (823:22)
async handleRequest
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/lib/router-server.ts (352:11)
async requestHandlerImpl
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/lib/router-server.ts (590:7)
async Server.requestListener
node_modules/.pnpm/next@15.3.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/src/server/lib/start-server.ts (154:7)

Now seeing that the hosted example is throwing some internal middleware error as well, I'm wondering if those are related, and if the tutorial code is just broken.

I'd appreciate it if someone could take a look at this.

Server Error #1091

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