Backing up with Virtualmin to Amazon S3 fails with Perl Error

I have now updated to Virtualmin 3.35 and am trying to run a backup to S3.

I've selected all my appropriate settings, entered in my S3 security information, and then run the backup.

Immediately on the next screen I get the following error.

Backup Virtual Servers
Starting backup of 10 domains to Amazon S3 bucket hosting-backup ..

HTTP/1.0 500 Perl execution failed Server: MiniServ/0.01 Date: Sat, 17 Feb 2007 19:36:35 GMT Content-type: text/html Connection: close
Error - Perl execution failed

syntax error at line 1, column 0, byte 0 at /usr/lib/perl5/site_perl/5.8.6/i386-linux-thread-multi/XML/ line 187

Closed (fixed)