Company is a required field, so you must have something mapped to the Company field in Salesforce. But there's a workaround for this! What you can do is add a Hidden Field to your form (do so by double-clicking on the form in the Page Builder and then adding a Hidden Field). You can call this Field "Company" and just put anything in the Default Value (there has to be something there, you cannot map a blank value).
You can then map this hidden field to your Company field in Salesforce
Let me know if that solves your problem.