Download failed Content length error

Hi,
what circumstances Bigfix client throw ‘Content length error’ message. The download URL is active

 Command failed (Can't download file 'Content length error.
C:\Program Files (x86)\BigFix Enterprise\BES Client\__BESData\CustomSite_Software\__Download\package.zip') download now {parameter "DownloadURL"}

maybe I’m not familiar enough. but normally the site is predetermined. so you dont really need to specify a site it should only be:

__Download\package.zip