How to DISTINCT PATHS?

i want to distinct END var, and i've tried GROUP BY

PATHS  START ?start = :公司法 END ?end {
  [] :clientRenderBlock ?end .
  ?end a owl:Class .
  } VIA {
  { ?start ?path ?end }
  UNION {
    ?end ?path ?start
    FILTER (?start NOT IN(owl:Class, owl:NamedIndividual))
  }
}  GROUP BY ?end

and the query failed with "invalid JSON response body"

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