Space copy in Confluence

[Test work]

created a space copy so each time I go to tool setting to copy space I get error

enclosed screenshot if you can suggest options

[Steven F Behnke]

The new space copy feature must have an issue, or something is corrupt with your page. You're best bet is to open a new Support Request at https://support.atlassian.com.

[Test work]

No issue when copying other pages which were created apart from this one which is proven to produce error

[Rob Woodgate]

Based on that error message, it appears that there is a permission problem.  If you don;t have permissions to view that page then you won't be able to copy it.  But yes, a Support ticket will verify that (or whatever the problem is) for you.