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java.lang.IllegalStateException: Unable to create a side-input view from input at com.google.cloud.dataflow.sdk.transforms.View$AsIterable.validate(View.java:277) at com.google.cloud.dataflow.sdk.transforms.View$AsIterable.validate(View.java:268) at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:366) at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:274) at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:161) at com.google.cloud.dataflow.sdk.io.Write$Bound.createWrite(Write.java:214) at com.google.cloud.dataflow.sdk.io.Write$Bound.apply(Write.java:79) at com.google.cloud.dataflow.sdk.io.Write$Bound.apply(Write.java:68) at com.google.cloud.dataflow.sdk.runners.PipelineRunner.apply(PipelineRunner.java:74) at com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.apply(DirectPipelineRunner.java:247) at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:367) at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:290) at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:174) at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound.apply(BigQueryIO.java:1738) at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound.apply(BigQueryIO.java:1440) at com.google.cloud.dataflow.sdk.runners.PipelineRunner.apply(PipelineRunner.java:74) at com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.apply(DirectPipelineRunner.java:247) at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:367) at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:274) at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:161) at co.uk.bubblestudent.dataflow.StarterPipeline.main(StarterPipeline.java:116)Caused by: java.lang.IllegalStateException: GroupByKey cannot be applied to non-bounded PCollection in the GlobalWindow without a trigger. Use a Window.into or Window.triggering transform prior to GroupByKey. at com.google.cloud.dataflow.sdk.transforms.GroupByKey.applicableTo(GroupByKey.java:192) at com.google.cloud.dataflow.sdk.transforms.View$AsIterable.validate(View.java:275) ... 20 more