Hi,

adding content databases should be a straightforward process.

Is the database created when you check it on the SQL Server itself? If not it might be a permission issue when the Database is to be created.

Best place to search is the ULS log of SharePoint of the time window around 11/12/2017 11:53 and search for the corellation ID provided.

There should be more information about what happened.

Best regards

Enrico