1. right click a cell and select Hyperlink to add Email Address link into the cell.
2. In address field, type a legal email address and press OK button.
3. save file and reopen it.
4. click hyperlink of that cell.
5. Would see a mail client pop out; this is normal and expected behavior.
6. Would see a dialog in Spreadsheet with message like following:(This is not the expected behavior)

"The resource you request is no longer available: /index.zul (z_b550).
This is normally caused by timeout, or opening too many Web pages.
You have to reload the page and try again."