Hi,
See if the following helps:
- Open a browser and go to report manager.
- Delete the report you updated
- Deploy the report again
- Then in report manager, go to the report again. Open the drop down menu and click Manage.
- Go to the Parameters tab. Check the settings there (Has Default, Null, etc), make changes if necessary.
Then try again.
I've experience similar problems during development when new/updated parameters are involved. Fortunately it can be fixed (even though most of the time I have to try Everything without being able to classify which solution against which type of issue.) Good luck.