Topic: SuperNova starts up with an error 'Invalid Parameter dol_bb'

Created on:

Last updated on:

Applies to: ScreenReader, SuperNova Magnifier, SuperNova Magnifier & Screen Reader, SuperNova Magnifier & Speech

NB: Please note that product names in this article may have changed since the time of writing.


When attempting to launch Supernova, the software fails to load and displays an error message referencing”dol_bb”


This can occur if for some reason the "Product Improvement Programme" (PIP) anonymous usage information has failed to be sent successfully to Dolphin. You can resolve this issue by removing the unsent PIP files from the computer.

To do this:

1. Open the Start menu and choose "Computer"
2. Open "Local Disk C:"
3. Open the folder called "Users"
4. Open the folder called "AppData"
5. Open the folder called "Temp"
6. Locate the folder called "PIP": and delete it. Supernova will create a new one the next time it starts.

TIP: If you do not have a folder called "AppData" when you reach step 4 above, ensure the option "Show Hidden Files and Folders" is turned on. This can be found in the "Tools" menu under the "Folder Options" item. In the "Folder Options" dialog box choose the "View" page to enable this option.


The information provided in this knowledge base article has been reviewed and is believed to be accurate and is provided "as is" without any warranties expressed or implied. In no event shall Dolphin Computer Access Ltd. nor its affiliates assume any responsibility for inaccuracies, errors, incidental or consequential damages resulting from any defect or omission in this document, even if advised of the possibility of such damages.

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