Attaching Files in NatSkin/TopicInteractionPlugin produces Internal Server Error

I've just installed a vanilla Foswiki 1.2.0_Beta_2 on an Ubuntu 14.04 platform and used the configure script to install the NatSkin Extension. This all worked without flaws. I also made sure I had all the perl modules listed as requirements in the INSTALL.html file.

Attaching files using the standard PatternSkin upload procedure works fine. When I try to attach the same files to topics (I tested with various file names, various topics and both on Chromium and Firefox) under NatSkin, I get an "HTTP Error" message and the upload fails (actually I first get a javascript notification about not being able to parse the JSON response, but this is caused by the HTTP error. Upon further inspection, the HTTP Error turns out to be a 500 Internal Server Error response to a POST request to /bin/rest/TopicInteractionPlugin/upload.

Neither the Apache error log nor the Foswiki error log records the error or any context, so I'm lost as to how to proceed to narrow down the cause of this error. Can anyone help?

-- PascalSchuppli - 25 Jun 2015

After some debugging, this seems to be caused by TopicInteractionPlugin not being up to date with all the changes to how UTF8 is now handled. I openend Tasks.Item13477 for it.

-- PascalSchuppli - 26 Jun 2015

Fixed in latest release.

-- MichaelDaum - 09 Sep 2015