TossPay SDK v2 issue

Hello Toss Team !
I hope you're doing well.
I'm facing an issue with the v2 SDK. My goal is to load the v2 javascript file to open my checkout page.
I got my checkout url in the https://api.tosspayments.com/v1/payments api response.
But when I tried to load the javascript v2 lib, I got this error in my console:
Uncaught r: V2 SDK는 V1 SDK와 함께 사용할 수 없어요. 마이그레이션 가이드를 확인해주세요. https://docs.tosspayments.com/guides/v2/get-started/migration-guide
    at https://js.tosspayments.com/v2/standard:7:526809
    at https://js.tosspayments.com/v2/standard:7:530917


I'm pretty sure that I don't refer the v1 documentation anywhere in my code, so I don't understand this issue.
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