Error message upon building sveltekit project...

[JimNayzium]

This is my first real sveltekit project that I have worked on for months on and off doing tutorials, so I am very very green with it all. But it works wonderfully locally and updates my firebase database perfectly and everything... Just trying to now build it so I can upload to my hosting company. I don't want to deploy via vercel, I just want to host the javascript files on my own hosting company.

I feel like something I am doing must be wrong because the app.html file is totally there and smiling at me as it tells me it's not there! hahahah.

Here is my vite.config.js

//* I replaced with my values below...
import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import Icons from 'unplugin-icons/vite'
// import { nodeLoaderPlugin } from "@vavite/node-loader/plugin";

export default defineConfig({
	plugins: [sveltekit(), Icons({ compiler: 'svelte' })],
	optimizeDeps: {
		include: ['@firebase/app', '@firebase/auth']
	},
  build: {
    sourcemap: true,
    target: 'esnext',
    polyfillDynamicImport: false,
    outDir: 'build',
    emptyOutDir: true,
    rollupOptions: {
      input: {
        main: './app.html'
      },
      allowExternal: ['@firebase/app', '@firebase/auth'],
      output: {
        manualChunks: {
          firebase: ['@firebase/app', '@firebase/auth']
        }
      }
    },
    minify: true
  },
  server: {
    host: 'localhost',
    port: 8819
  },
  resolve: {
    alias: {
      $lib: '/src/lib'
    },
    extensions: ['.mjs', '.js', '.ts', '.jsx', '.tsx', '.json', '.svelte']
  },
  esbuild: {
    jsxFactory: 'h',
    jsxFragment: 'Fragment'
  },
  // Add the allowJs option to allow compilation of JavaScript files
  // Set it to true to allow both TypeScript and JavaScript files
  // Set it to false to only allow TypeScript files
  // By default, allowJs is false
  // See https://vitejs.dev/config/#allowjs
  allowJs: true
});```

Here is the package.json
```{
	"name": "The I.F.F. - Injury Free Fantasy",
	"version": "0.0.4",
	"private": true,
	"author": {
		"name": "Marty Simpson",
		"email": "[email protected]",
		"url": "http://martysimpson.com"
	},
	"scripts": {
		"dev": "vite dev",
		"build": "vite build",
		"preview": "vite preview",
		"prepare": "npm run smui-theme-light && npm run smui-theme-dark",
		"smui-theme-light": "smui-theme compile build/smui.css -i src/theme",
		"smui-theme-dark": "smui-theme compile build/smui-dark.css -i src/theme/dark",
		"check": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json",
		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json --watch",
		"lint": "prettier --plugin-search-dir . --check .",
		"format": "prettier --plugin-search-dir . --write ."
	},
	"devDependencies": {
		"@iconify/json": "^2.2.119",
		"@smui/button": "^7.0.0-beta.15",
		"@smui/circular-progress": "^7.0.0-beta.15",
		"@smui/common": "^7.0.0-beta.15",
		"@smui/data-table": "^7.0.0-beta.15",
		"@smui/dialog": "^7.0.0-beta.15",
		"@smui/icon-button": "^7.0.0-beta.15",
		"@smui/linear-progress": "^7.0.0-beta.15",
		"@smui/list": "^7.0.0-beta.15",
		"@smui/paper": "^7.0.0-beta.15",
		"@smui/tab": "^7.0.0-beta.15",
		"@smui/tab-bar": "^7.0.0-beta.15",
		"@smui/textfield": "^7.0.0-beta.15",
		"@sveltejs/adapter-auto": "^2.0.0",
		"@sveltejs/kit": "^1.20.4",
		"prettier": "^2.8.8",
		"prettier-plugin-svelte": "^2.10.1",
		"sass": "^1.68.0",
		"smui-theme": "^7.0.0-beta.15",
		"svelte": "^4.0.5",
		"svelte-check": "^3.4.3",
		"svelte-preprocess": "^5.0.4",
		"typescript": "^5.0.0",
		"unplugin-icons": "^0.17.0",
		"vite": "^4.4.2"
	},
	"type": "module",
	"dependencies": {
		"@sveltejs/adapter-node": "^1.3.1",
		"@sveltejs/adapter-vercel": "^3.0.3",
		"bootstrap": "^5.3.2",
		"cookie": "^0.5.0",
		"dotenv": "^16.3.1",
		"firebase": "^10.4.0",
		"firebase-admin": "^11.10.1",
		"node-fetch": "^3.3.2",
		"svelte-material-icons": "^3.0.5",
		"sweetalert2": "^11.7.28"
	}
}

Here is the terminal error pasted:

The following Vite config options will be overridden by SvelteKit:

• build.outDir
• build.rollupOptions.input

vite v4.4.9 building SSR bundle for production...
Unknown input options: allowExternal. Allowed options: acorn, acornInjectPlugins, cache, context, experimentalCacheExpiry, experimentalLogSideEffects, external, inlineDynamicImports, input, logLevel, makeAbsoluteExternalsRelative, manualChunks, maxParallelFileOps, maxParallelFileReads, moduleContext, onLog, onwarn, perf, plugins, preserveEntrySignatures, preserveModules, preserveSymlinks, shimMissingExports, strictDeprecations, treeshake, watch
✓ 20 modules transformed.
✓ built in 582ms
Could not resolve entry module "./app.html".
error during build:
RollupError: Could not resolve entry module "./app.html".
at error (file:///Users/martysimpson19/Documents/Jobs/Svelte-Projects/app-simple-grudgematch/the-iff-repository/node_modules/rollup/dist/es/shared/node-entry.js:2287:30)
at ModuleLoader.loadEntryModule (file:///Users/martysimpson19/Documents/Jobs/Svelte-Projects/app-simple-grudgematch/the-iff-repository/node_modules/rollup/dist/es/shared/node-entry.js:24876:20)
at async Promise.all (index 0)