PathNotFoundException: Cannot open file, path = 'file:///usr/local/server/src/static/index.html

PathNotFoundException: Cannot open file, path = 'file:///usr/local/server/src/static/wellcome.html' (OS Error: No such file or directory, errno = 2)
#0      _File.throwIfError (dart:io/file_impl.dart:675)
#1      _File.openSync (dart:io/file_impl.dart:490)
#2      _File.readAsBytesSync (dart:io/file_impl.dart:574)
#3      _File.readAsStringSync (dart:io/file_impl.dart:624)
#4      getStaticFile (package:starter_template/utils.dart:23)
#5      main (package:starter_template/main.dart:29)
<asynchronous suspension>
#6      Future.any.onValue (dart:async/future.dart:615)
<asynchronous suspension>

main(){
final String _dirname = Platform.script.toFilePath();
final String staticFolder = '${Uri.file(_dirname).resolve('../static')}';
String getStaticFile(String fileName) {
  return File('$staticFolder/$fileName').readAsStringSync();
}

 final String htmlFile = getStaticFile('wellcome.html');
}