Errors / warnings after fresh install

After a fresh install of the module, upon navigating to the "Galleris List" [sic] link in the navigation, the following warnings/ errors are displayed. This may be a symptom of not having a gallery and image node / content type set up. If that is the case, then a "default" gallery should be created automatically if possible, if not, then instructions to create the necessary nodes should be included in addition to the text "There's no gallery now."

See the attached screenshot.