Missing column in inferred type

I have a CSV text file with two columns: quoted text, integer

"Beginner : read(ing) tutorial material/solved some coding exercises",11
"Beginning : wrote less than 2 libraries or applications/unpublished",30
"Intermediate : wrote and published on Hackage 3 or more libraries/applications",16
"Advanced intermediate : wrote multiple libraries/applications - co-maintain various packages",13
"Advanced : contribute regularly patches to GHC - among other things",0
"Expert : proposed or commented on one or more language extensions",0

(yes, it's from the DataHaskell survey from last month)

My program is as follows, as per the Frames tutorial :

{-# language TemplateHaskell, DataKinds, FlexibleContexts #-}
module Lib where

import Frames
import Frames.CSV 

tableTypes' (rowGen "april-5-2018/data/q1"){
    rowTypeName = "Q1Row"
  , columnNames = [ "Label", "Count" ]
  , tablePrefix = "Q1"}

But after noticing a typechecking problem (typeQ1Count not in scope), I dumped the generated TH with -ddump-splices, and in fact the types for the second column are not generated. How come? Is there a problem with the text in the first column? Simpler rows such as "abc", 123 work as intended.

src/Lib.hs:(26,1)-(29,23): Splicing declarations
    tableTypes'
      (rowGen "april-5-2018/data/q1")
        {rowTypeName = "Q1Row", columnNames = ["Label", "Count"],
         tablePrefix = "Q1"}
  ======>
    type Q1Row =
        Record ((ghc-prim-0.5.1.1:GHC.Types.:) ((:->) "Label" Text) '[])
    q1RowParser :: ParserOptions
    q1RowParser
      = ((ParserOptions (Just ((map Data.Text.pack) ["Label", "Count"])))
           (Data.Text.pack ","))
          (RFC4180Quoting '"')
    type Q1Label = (:->) "Label" Text
    q1Label ::
      forall f_a7sS rs_a7sT.
      (Functor f_a7sS,
       RElem Q1Label rs_a7sT (Data.Vinyl.TypeLevel.RIndex Q1Label rs_a7sT)) =>
      (Text -> f_a7sS Text) -> Record rs_a7sT -> f_a7sS (Record rs_a7sT)
    q1Label = rlens (Data.Proxy.Proxy :: Data.Proxy.Proxy Q1Label)
    q1Label' ::
      forall f_a7sU g_a7sV rs_a7sW.
      (Functor f_a7sU,
       Functor g_a7sV,
       RElem Q1Label rs_a7sW (Data.Vinyl.TypeLevel.RIndex Q1Label rs_a7sW)) =>
      (g_a7sV Q1Label -> f_a7sU (g_a7sV Q1Label))
      -> Rec g_a7sV rs_a7sW -> f_a7sU (Rec g_a7sV rs_a7sW)
    q1Label' = rlens' (Data.Proxy.Proxy :: Data.Proxy.Proxy Q1Label)

acowley / Frames

Missing column in inferred type #110