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Maybe then the problem is with your server, or with your folder permissions?
I would complain with your server provider that you can't delete all the files at once.
In the meantime, you can also try this workaround:
- create a new folder "smarty_cache0" in /xoops_data/caches/
- rename the "smarty_cache" to "smarty_cache1"
- rename the "smarty_cache0" to "smarty_cache"
- delete "smarty_cache1"
Do it with the other folders.