(2011-12-30 12:18:53) Information: The Source Document reload complete. DocumentPath=\\DEV01\SourceDocuments\XYZ.qvw
(2011-12-30 12:18:53) Information: Memory Allocation Delta for this file=1.11 Mb. Available Physical Memory Before Reload=242813.36 Mb. Available Physical Memory After Reload=242808.78 Mb. Total Physical Memory=242808.78 Mb.
(2011-12-30 12:18:53) Error: The Source Document was NOT reloaded successfully. DocumentPath\\DEV01\SourceDocuments\XYZ.qvw
Your log shows, there is some script error (i.e. ErrorCount = 3 ) in your application.
As Sunil said, go to the path where the application resides and check for log. If you are not able to find the log activate the log for you application from "Setting Menu --> Document Property--> General Tab --> Generate LogFile". Now try to reload the application and check the log.
if you could post that log here, it would be very useful to debugge.