When you close the qoutation, the ampersand is only joining the first part of the tag expression to the second part, rather than being interpreted within the expression.
"SpellType.cHelpArn" & "CasterType.MemBook"
is interpretted as
"SpellType.cHelpArnCasterType.MemBook"
Which is gobbledygook to the program. You want the "and" inside the expression, like so:
"SpellType.cHelpArn & CasterType.MemBook"
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