How to resolve Cloudflare invalid SSL (error526)?

I moved my website hosting to Inmotion from Bluehost but the domain is currently on Bluehost(it had Cloudflare on Bluehost). Now I moved it to Inmotion hosting and I create a Cloudflare account for it to set up on my website. I set up Cloudflare and changed domain DNS to Cloudflare DNS, but now when I start Cloudflare from my Cloudflare panel it shows ERROR 526 on my website. I spoke to Inmotion support and Bluehost support many times and they told me I should contact with Cloudflare team because the problem is from Cloudflare and nobody answered me there.

For more information, I went all the ways that were found in the Cloudflare community or in google but couldn't solve this problem. Please help me.