The test script failed to execute on the web server.  The error could be caused by several things.  Check:
- the 'Path to the Perl shell'
- the 'CGI script extension'
- the 'Path to CGI-BIN'
- the 'CGI-BIN URL'
- the amount of web space left on your server
- if your server is configured to accept POSTs to CGI scripts
- the permissions on the server:
On Linux/Unix based servers the permissions should be:
cgi-bin (755)– drwxr-xr-x
Online Store Folder (777)– drwxrwxrwx
On Windows based servers (need to be checked with the hosting company): 
IIS
cgi-bin = read/execute
Online Store Folder = read/write/execute
NTFS
cgi-bin = Catalog's FTP account needs 'Change' permissions on the directory
Online Store Folder = Catalog's FTP account needs 'Change' permissions on the directory AND the IUSR_<servername> account needs to have 'Change' permissions on the directory