error _flutter is not defined when Build Static Html

[bobwatcherx]

Question

i want to make flet to apk with flutter webview. so i will use flutter webview with flet . but when I publish it to html and open it in the browser file:///home/mino/belajar/fletapk/dist/index.html it appears the error _flutter is not defined . and the flet logo looks missing how to solve it

Code sample

No response

Error message

Eorrr console log browser
Uncaught ReferenceError: _flutter is not defined
    <anonymous> file:///home/mino/belajar/fletapk/dist/index.html:106
index.html:106:7
    <anonymous> file:///home/mino/belajar/fletapk/dist/index.html:106

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• I have searched for answers to my question both in the issues and in previous discussions.

[bobwatcherx]

it works but only shows the logo only . and nothing is visible

in dist/index.html
i change
<base href="./">

and get error browser Uncaught Error: Failed to load asset at "assets/FontManifest.json" (0)
h file:///home/mino/belajar/fletak/simpleflet/assets/dist/main.dart.js:5057
hw file:///home/mino/belajar/fletak/simpleflet/assets/dist/main.dart.js:35652
s file:///home/mino/belajar/fletak/simpleflet/assets/dist/main.dart.js:6331
$2 file:///home/mino/belajar/fletak/simpleflet/assets/dist/main.dart.js:49579