Thanks for contacting Syncfusion Support.
We can reproduce the reported issue “Error DD003: Corrupted file” only when the data source used as PostgreSQL-views connection. Could you please confirm whether the data source used in your dashboard report is PostgreSQL – views connection?
If yes, this fix will be available in the upcoming beta build which is expected on November 16th, 2018. If not, please share the connection type used and share the type tables/views/stored procedure which you have used to connect data source.
Please share us the event and error log files to investigate the cause of the issue further from our end for prompt solution.
If possible, we requested you to share the dashboard with accessible data source that you have trying to open.