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Hello,

I edited your question so that it is actually a question, not just a quick copy-paste.

It seems that you have noticed in the online documentation that the code for splitting fields over number fields is very recent in Sage.

As a consequence, it will only work if you are using a recent version of Sage, which includes these changes. For instance, in Sage 6.1.1 the command you tried will work, but in Sage 5.12 it will not.

What version of Sage are you using? If you are able to, you should install Sage 6.1.1.