Error 22023

SR014: Function __set_user_id needs a string as argument 1, not an arg of type INTEGER (189)
in
__set_user_id:(BIF),
        __01 => 0,
WS.WS.GET,
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193)