Why does the XML API respond with a Sign In required error?

If you are using the Quickbase XML API (say you are calling API_AddRecord using Javascript to handle a form submission) and you get a sign in error like the one shown below:

NOTE: This article refers to Quickbase's XML API. We now offer a JSON-bsed, RESTful API which we recommend for future app development in Quickbase apps. This article will remain here to help app builders troubleshoot existing apps using the older XML API. You can visit our developer portal for details on using the Quickbase RESTful API.

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API_AddRecord
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Sign-in required
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This means that the developer who wrote the API call has not called API_Authenticate to first get a valid ticket before calling other APIs. Please see our XML API Guide for more details about how to use the Quickbase XML API.