Failed to load the page

[nikkicolewms]

I'm receiving this message and my store page is not opening, not allowing me to change toa new theme

 

Failed to load the page

This page is not compatible with the editor due to one of the following issues:

• Page is redirecting to an unsupported URL
• Page failed to load due to an error

[ik4pk652]

How to fix this issue, I am facing same problem