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I’m pretty new to dart/flutter, so let me know if there is anything I can clarify. I’m trying to download a file, but when I try to access it, I get the error “Filesystem Exception: Cannot open file, path = ‘./data.csv’ Read-only file system, erne = 30)” What am I doing wrong, and how can I fix this?

 downloadTextFile() {
    HttpClient client = new HttpClient();
    client.getUrl(Uri.parse(*I put the link I used here, but it's sort of long*))
        .then((HttpClientRequest request) {
      return request.close();
    })
        .then((HttpClientResponse response) {
      response.pipe(new File('./data.csv').openWrite());
    });
    readFileByLines();
  }

  void readFileByLines() {
    File file = new File('./data.csv');
    List<String> lines = file.readAsLinesSync();
    lines.forEach((l) => print(l));
  }