SharePoint Designer | Server Error: masterpage referenced cannot be deleted

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server error: this item cannot be deleted because it is still referenced by other pages

how stupid is this:
-> create new folder "delete"
-> mode unwanted masterpages to "delete" folder
-> delete folder named "delete"

And that's it! Crazy ain't it?

http://metahat.blogspot.com/2007/10/server-error-this-item-cannot-be.html

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