private void ensureWarningTracesIsMutable() {
      if (!((bitField0_ & 0x00000400) != 0)) {
        warningTraces_ =
            new java.util.ArrayList<com.google.cloud.websecurityscanner.v1.ScanRunWarningTrace>(
                warningTraces_);
        bitField0_ |= 0x00000400;
      }
    }
<pre>
Output only. If result_state is an ERROR, this field provides the primary reason for
scan's termination and more details, if such are available.
</pre>

<code>.google.cloud.websecurityscanner.v1.ScanRunErrorTrace error_trace = 10;</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanRun.java