Error in feed after changin links by Custom Permalink

We’ve got error for feed pages, after changin links by this plugin.

My site name: sportklan.ru

pages with error:
/promokod-fonbet/feed/
/1hstavka-promokod-dlya-registratsii/feed/
/betmaster-bonus-10000-rubley/feed/
/luckybet-promokod-2019/feed/
/meksika-shvetsiya-na-27-iyunya-2018/feed/
/levante_barselona_16_dekbarya/feed/
/stavki-na-e-malkina/feed/
/promokod-na-melbet/feed/
/besplatnoe-toto-v-1xbet-kak-Igrat/feed/
/betcity-fribet/feed/
/aktivnym-kommentatoram-sajta/feed/
/winline-bonus/feed/
/melbet-bonus/feed/
/fribet-na-10-000-rubley-ot-bk-olimp/feed/
/888-freebet/feed/
/bonus-ot-vinlayn-bez-depozita-1000-rubley/feed/
/energy-promokod/feed/
/promokod-1xbit-bonus-125-1hbit/feed/
/fribet-1000-rubley-ot-parimatch/feed/
/liga-stavok/feed/
/parimatch-2500-na-schet/feed/
/vinlayn-promokod-bonus-winline/feed/
/promokod-1win-pri-registratsii-1vin/feed/
/1hstavka-bonus/feed/
/1xbet/feed/
/marathon-bet-bonus/feed/
/promokod-betmaster-pri-registratsii/feed/
/promokod-dlya-malina-kazino-i-stavki/feed/
/betcity/feed/
/bingo/feed/
/bonusyi-1000-rubley-i-500000/feed/
/promokod-1xbet-1hbet/feed/
/promokod-olimp/feed/
/sem-fribetov-ot-ligi-stavok/feed/
/1000-rublej/feed/
/fonbet-500-rubley/feed/
/promokod-betsstore/feed/
/riobet-promokod-pri-registratsii/feed/
/tennisi-bet/feed/
/favbet/feed/
/portugaliya-ispaniya-15-06/feed/
/podarok-ot-sportklan/feed/
/1xslots-promokod-pri-registratsii/feed/
/bingo-bum-promokod-dlya-registratsii/feed/
/bonus-kod-leon-i-leonbets/feed/
/tennesi-bet/feed/
/andrej-arshavin/feed/
/bingo-boom/feed/
/za-aktivnuyu-poziciyu/feed/
/fribet-melbet-promokod-100/feed/
/shahter_lion_12_dekabrya/feed/
/valyadolid-sporting-hihon/feed/
/melbet/feed/
/portfolio-view/bonus-ot-vinlayn-bez-depozita-1000-rubley/feed/
/portfolio-view/bonus-kod-leon-i-leonbets/feed/
/portfolio-view/riobet-promokod-pri-registratsii/feed/
portfolio-view/1hstavka-promokod-dlya-registratsii/feed/
/portfolio-view/promokod-olimp/feed/
/portfolio-view/1000-rublej/feed/
/portfolio-view/fonbet-500-rubley/feed/
/portfolio-view/bingo/feed/
/portfolio-view/bingo-boom/feed/
/portfolio-view/tennesi-bet/feed/
/portfolio-view/leon-povyshennyj-bonus/feed/
/portfolio-view/1xbet/feed/
/portfolio-view/888-freebet/feed/
/portfolio-view/winline/feed/
/portfolio-view/parimatch-2500-na-schet/feed/
/portfolio-view/aktivnym-kommentatoram-sajta/feed/
/portfolio-view/za-aktivnuyu-poziciyu/feed/
/portfolio-view/1hstavka-bonus/feed/
/portfolio-view/melbet/feed/
/portfolio-view/favbet/feed/
/portfolio-view/fribet-melbet-promokod-100/feed/
/portfolio-view/promokod-1xbet-1hbet/feed/
/portfolio-view/promokod-1win-pri-registratsii-1vin/feed/
/portfolio-view/liga-stavok/feed/

and also interesting fact, this error gone, when I add /blog/ after site name like this:

https://sportklan.ru/blog/portfolio-view/liga-stavok/feed/

How to fix it? help me please.