private com.google.protobuf.SingleFieldBuilderV3<
              com.google.rpc.Status, com.google.rpc.Status.Builder, com.google.rpc.StatusOrBuilder>
          getErrorFieldBuilder() {
        if (errorBuilder_ == null) {
          errorBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.rpc.Status,
                  com.google.rpc.Status.Builder,
                  com.google.rpc.StatusOrBuilder>(getError(), getParentForChildren(), isClean());
          error_ = null;
        }
        return errorBuilder_;
      }
<pre>
Output only. The error that caused the queued resource to enter the
FAILED state.
</pre>

<code>.google.rpc.Status error = 1 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResourceState.java