Silverstripe admin user - URGENT not allowing me to add new project ? page goes blank

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

Silverstripe Version:

Hi there, i’m the admin manager of our company website run by silverstripe.
We have many projects listed on our website for interior design purposes. Recently i went to delete one image from a project and the entire project disappeared, now the website doesn’t allow me to add any projects?
URGENT - hope you can help. Thanks so much Rebecca

Details of your query go here

// Include any relevant code. If you have a lot of code, link to a gist instead.