Video upload error -- Failed to find flength file
This is a well known error with the uploader component (which is commonly used by many scripts like clipshare, phpmotion etc). This is just a cosmetic error and nothing to do with the real uploading process. The best "workaround" for this issue is to disable the error message. To do so, locate the file cgi-bin/uu_ini_status.pl inside your script folder and change the value of my $flength_file_exists from 0 to 1.
The bad news is, you won't see the upload status counter. The good news is, your upload process will work just fine!