public Builder mergeStateError(com.google.cloud.workflows.v1.Workflow.StateError value) {
      if (stateErrorBuilder_ == null) {
        if (((bitField0_ & 0x00000800) != 0)
            && stateError_ != null
            && stateError_
                != com.google.cloud.workflows.v1.Workflow.StateError.getDefaultInstance()) {
          getStateErrorBuilder().mergeFrom(value);
        } else {
          stateError_ = value;
        }
      } else {
        stateErrorBuilder_.mergeFrom(value);
      }
      if (stateError_ != null) {
        bitField0_ |= 0x00000800;
        onChanged();
      }
      return this;
    }
<pre>
Output only. Error regarding the state of the workflow. For example, this
field will have error details if the execution data is unavailable due to
revoked KMS key permissions.
</pre>

<code>
.google.cloud.workflows.v1.Workflow.StateError state_error = 12 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/Workflow.java