I only have my iPhone at the moment and so cannot look at your file, but make sure that your name calculation field specifies a text result type.
it is text type
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I've had a look and indeed philmodjunk found the issue. Your calculation's result in the Singer table is of type Number, not Text! Change it to Text and it'll work.
Edit for clarity and Phil's alias.
Oh Yeaaa I Learn It , Thank You Very Much :*