Please check the source of your web page in a browser to ensure that there is a div with id="viewsstyle--vista-galeria--default" on your page.
The Juicebox module for Drupal is responsible for creating the code which goes on your web page.
It should create a container for your gallery and embed the gallery into it.
It sounds like the container's id is being used in the JavaScript embedding code but that the container itself does not exist on your web page.

Please note that we did not write the Juicebox module for Drupal ourselves and as this query seems to be directly related to the module's code (rather than Juicebox itself), I would recommend that you post your query in the Drupal forum where the author of the module should be able to help you out further.

In the meantime, please post the URL to your web page. I will be happy to take a look and help further if I can but the author of the module (who is more familiar with its code than myself) is likely to be the best source of help.