When working with schema definitions and transformations, it can cause workflow disruptions to encounter a "AttributeError" in Apache Beam. When integrating to_dataframe with custom schemas, this common issue typically occurs because of schema mismatches. Using Apache Beam's DoFn and Map methods, we address the error and provide organized solutions in this tutorial, converting data effectively while maintaining schema integrity. You may streamline data pipelines from Pub/Sub to BigQuery with the help of solutions like type validation, schema enforcement advice, and real-world coding examples.