Error when I try to download more files! "File cannot be read"

Hi, I created a new installation of owncloud importing from an old installation only the table oc_users, now when I try to download multiple files at the same time I get the following error "File can not be read" how can I do to remedy the problem? Thanks in advance

PS: My provider is aruba if it can help you, but I also use owncloud on another domain with aruba as hosting and it does not create problems