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

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Silverstripe Version:
Unknown?

Question:
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

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