Hi @osninc! Based on the error message that you’re getting it sounds like there’s something specific about the type of Salesforce object that you’re using, rather then the way that the Zap is set up (required fields, etc). If you’re not familiar with objects in Salesforce this guide from Salesforce gives you the fundamentals: Understand Custom & Standard Objects
From what you’ve said, I would guess that there’s something in the set up of the object that is causing an error with Zapier. In this case, the best thing is probably to contact the Zapier support team so that they can dig into your Zap and how your Salesforce instance is set up. You can contact Support using the Get Help form. When you do, try to give them as much information about the "Bid__c" object as possible as that will help them to get up to speed quicker.