Questions for querying from spectrum data stored STRUCT-STRUCT-ARRAY data type.

Questions for querying from spectrum data stored STRUCT-STRUCT-ARRAY data type. There is a table "psn_member_chnl" in spectrum with multi level STRUCT type data such as

struct<publish_info:
    struct<category:
         struct<svc_genre_id_list:array[svc_genre_id:bigint]>
>
>

I run a query from psn_member_chnl like bellow:

select a.member_chnl_id, a.character_no, a.eval_info.eval_status_type
  , b.track_id
  , c.svc_genre_id
from rs_flo_poc.psn_member_chnl a, a.track_list b, a.publish_info.category.svc_genre_id_list c

Then error comes up as bellow:

SQL Error [XX000]: ERROR: "c.svc_genre_id" is of scalar type BIGINT. No further nested access is permitted.

Please give me any hint to solve this error.