Duotone problems on www.remarpro.com new install

Hello All

I hope someone may be able to help me. I have newly transferred to www.remarpro.com from wordpresss.com…finally got there in the end!

However, my main webpage is coming up with an error message on the top
and only two of my posts are showing. (Yet all my posts are showing in the dashboard)

https://www.vickiclarkephotography.com/

I exported the file from wordpress.com and imported it into www.remarpro.com.

Have I done something blatantly wrong?

I have also lost the archive page which was part of the theme, just says page not found.

Is there a way I can just delete the whole theme in editor, and reupload it? or should I delete all my posts and start from scratch?

Hope someone may be able to help.
Thank you!
Vicki