First, ensure that "mode_rewrite" is enabled on your server.
If "mode_rewrite" is enabled You may be missing upload .htaccess file. Please upload .htaccess file to your server public directory(public_html/www/public).
Then it will be fixed.
if you don't find htaccess file please download the file from here: https://drive.google.com/file/d/1xgKBg6RtWKqpBjFpUI3rPg6DcJ9hJ69X/view?usp=sharing
Yet you got any issue you may check this video: https://www.youtube.com/watch?v=ay6NoLDA7Nc
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