title: Unable to start training my GCP AutoML Entity Extraction model on Web UI
body: <p>I am trying to train my first GCP AutoML Entity Extraction model using AutoML Web UI.</p>
  <p>I loaded and annotated 74 PDFs (6-pages PDF) with 9 labels (see <a href="https://i.stack.imgur.com/idBKt.png" rel="nofollow noreferrer">Screenshot of GCP AutoML Entity Extraction</a>). It seems that I respected the 10 annotations minimum for both train, validation and test sets. Nevertheless, I am unable to click on Start Training (greyed-out button on Web UI). No indication is given by the GCP AutoML Web UI.</p>
  <p>Any help would be greatly appreciated. Thanks.</p>
  <p>Edit: I forgot to mention that the dataset is located in European Union.</p>