I have a problem with the same error. After renaming a file in VSCode and updating the imports, the error shows up for every page load of a certain route ('/'):

SvelteKitError: Not found: /src/lib/utils/bytesToHex.ts at resolve (PROJECT_FOLDER\node_modules@sveltejs\kit\src\runtime\server\respond.js:530:13) ...

The new filename is "uuid.ts".