The message is pretty explicit: the column "Name" cannot be a null value.
We can't see your SP, but you need to look at two things:
1) Your table definition: the "Name" column is declared as
Name NVARCHAR(...) NOT NULL
Which menas that SQL will reject any lines which do not contain actual name information.
2) Your model class, and the content of the Name property.
At a guess,
model.Name
is empty for some reason and that causes your INSERT to fail. But we can't look at why, because that requires you code running, the data it is processing, and your DB - and we have no access to any of them.
So, it's going to be up to you.
Fortunately, you have a tool available to you which will help you find out what is going on: the debugger. If you don't know how to use it then a quick Google for "Visual Studio debugger" should give you the info you need.
Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.
Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!