Thank you, Brandon! Now it works like a charm.
[solved]
The update appeared in the plugin directory, but as I said the update contains the same files of version 3.0.3.
I tried updating the plugin in both ways: by direct download from http://downloads.wp.xz.cn/plugin/wordpress-access-control.3.0.4.zip and via WordPress administrative interface… but the 2 errors are still there and there is no diff between the old file and the new one.
Brandon, I suppose that in wordpress-access-control.3.0.4.zip you mistakenly packed wordpress-access-control.3.0.3 files.
