User is unable to claim a Giveaway

Steps:
1. Login as admin.
2. Create a Giveaway node.
3. Go to Giveaway page.
4. Click "Click Here to get your giveaway"

Expected Result:
User should be able to claim the key.

Actual Result:
Two errors are displayed as:
1. Error related to Private giveaway.
2. Base table or view not found.

Please find the screenshot attached.