Should really send this to our Support team at
However, error messages I have seen that are similar suggest that something has happened to your back-end mySQL database, which serves as the local sandbox for storing data, and also serves as the blending “hub” for cross-connection queries.
Hopefully, you’re on the latest version, which is 4.3. If not, I highly recommend you to upgrade.
After that, two other things I would try:
Confirm the location of your data hub (while in TDP, go to Tools | Options | Local Storage | General). Sgut down TDP, and re-name that “DataHub” folder (e.g. to “DataHubBAK”, say). Then re-launch Toad Datapoint to see if Toad creates a new, uncorrupted hub. See if you can connect successfully to Local Storage, and that cross-connection queries run ok.
If above doesn’t work, try re-installing Toad Datapoint. May want to export your connections before doing this, and possibly export any important data that you may have stored in local Storage.