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"No identifiers for selected download sources.". The problem is clear: you configured Count Pages plugin to download page count (instead of generating by analysing the book file) from one of the supported source websites (like Goodreads) but you didn't add to book metadata the ID (identifier) from that website before trying to get page count.
In case of Goodreads the ID can be populated by using either Goodreads Metadata plugin or by using Goodreads Sync plugin. Or manually by copy/paste from Goodreads website into Calibre's Edit metadata window.
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