Cannot update btheme and plugins

I cannot update the btheme and plugins. when i try to update the betheme through the update wizard then I get the error message below. I've updated now the betheme through ftp. But I still need to update the plugins. Also by the plugin updates I get the error below.

The update of extensions failed : "An error occurred when updating .... : The archive could not be installed. This package does not contain any files."

please help



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