private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.workflows.executions.v1beta.Execution.Error,
            com.google.cloud.workflows.executions.v1beta.Execution.Error.Builder,
            com.google.cloud.workflows.executions.v1beta.Execution.ErrorOrBuilder>
        getErrorFieldBuilder() {
      if (errorBuilder_ == null) {
        errorBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.workflows.executions.v1beta.Execution.Error,
                com.google.cloud.workflows.executions.v1beta.Execution.Error.Builder,
                com.google.cloud.workflows.executions.v1beta.Execution.ErrorOrBuilder>(
                getError(), getParentForChildren(), isClean());
        error_ = null;
      }
      return errorBuilder_;
    }
<pre>
Output only. The error which caused the execution to finish prematurely.
The value is only present if the execution's state is `FAILED`
or `CANCELLED`.
</pre>

<code>
.google.cloud.workflows.executions.v1beta.Execution.Error error = 7 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-workflow-executions/proto-google-cloud-workflow-executions-v1beta/src/main/java/com/google/cloud/workflows/executions/v1beta/Execution.java