When I play my playlists with iTunes on Mac OS when offline, I get a lot of messages

iTunes could not connect to iTunes Store. The network is down or unavailable.

When I start to play music for my sleep, the next morning I see these error messages:

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It is quite irritating! Why this silly app always wants some connection... I tried to search this using Google, but nothing at all about this specific problem.

How can I fix these errors?

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