public Builder mergeScanConfigError(
        com.google.cloud.websecurityscanner.v1.ScanConfigError value) {
      if (scanConfigErrorBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && scanConfigError_ != null
            && scanConfigError_
                != com.google.cloud.websecurityscanner.v1.ScanConfigError.getDefaultInstance()) {
          getScanConfigErrorBuilder().mergeFrom(value);
        } else {
          scanConfigError_ = value;
        }
      } else {
        scanConfigErrorBuilder_.mergeFrom(value);
      }
      if (scanConfigError_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
Output only. If the scan encounters SCAN_CONFIG_ISSUE error, this field has the error
message encountered during scan configuration validation that is performed
before each scan run.
</pre>

<code>.google.cloud.websecurityscanner.v1.ScanConfigError scan_config_error = 2;</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanRunErrorTrace.java