Looks like the reload failed. For details on the reload failure, look at the reload log file. This is a file in the same folder as the qvw document, and with the same name (except with a .log extension).
If there is no reload log, you can enable it by opening the qvw in the desktop client (directly and not via "Open in server"), go to Document Properties and check "Generate Logfile", then click Save. Run the reload task again to create the log file. The file will be overwritten each time the document is reloaded.
First do what Jonathan suggested. Your error messages are lifted from a Tasklog which is totally useless if your reload errors are caused by a bad script. Data Source Errors are nicely presented in your Document Log.
Locate or Create a Document log (generated in 2 locations, Jonathan's is the easiest one) and open it in a text editor like Notepad.