Permalink structure change generates error

[hwasoo25]

Hi, I changed the permalink structure as postname
and it generates errors for pages.

For example, blog page permalink changed as webpage.com/blog
but if I go to that URL, It generates error message like attached image.

Could you pls let me know how to fix this issue?

Regards

[colorlibsupport]

Hi there

May I see it? please provide url of the website with the problem and I will check it