This issue can happen if you have had versions enabled in the space, but you have deleted them.
If you want to delete the page
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Disable Scroll Platform, Scroll Versions and Scroll Runtime apps temporarily from the App Management.
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Navigate to the page <confluence base URL>/pages/viewpage.action?pageId=<page id>
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Delete the page
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Enable Scroll Platform, Scroll Versions and Scroll Runtime again
If you want to keep the page
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Disable Scroll Platform, Scroll Versions and Scroll Runtime apps temporarily from the App Management.
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Navigate to the page <confluence base URL>/pages/viewpage.action?pageId=<page id>
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Copy the content of the page
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Create new page in other space and paste the copied content
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Delete the old page
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Enable Scroll apps again
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Move the page from the temporary location to the correct space