Each heading is the message exactly as the screen shows it. For sign-in messages, see Sign-in troubleshooting.
「読み込み中...」
When it appears
While a page is loading.
What to do
If it does not change, reload the page.
「地図を読み込み中...」
When it appears
In the map's place, until the map is ready.
What to do
If it does not change, reload the page.
「エラーが発生しました」
When it appears
When an error occurs while the screen is shown, together with 「データの読み込み中に問題が発生しました。ネットワーク接続を確認して再試行してください。」.
What to do
Check your network connection, then click 「再試行」.
「ページが見つかりません」
When it appears
When you open a page that does not exist.
What to do
Clicking 「ダッシュボードに戻る」 takes you to the top page (/).
「データなし」
When it appears
For values that are not published, and for the ridership of stations that ODPT does not cover.
What to do
This is the correct display. Missing values are not estimated or filled in.
「サンプルデータ（暫定）— 実データではありません」
When it appears
On panels that show sample values, and on panels that switched to sample values because upstream data could not be fetched.
What to do
To see which panels show real data, see Live data vs sample data.