I have installed Mango (2.0.6) on a Debian server (6.0.7) with java 7u21.
The hardware is Microclient Sr (http://www.google.fr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Fwww.norhtec.com%2Fproducts%2Fmcsr%2F&ei=YfGwUarnLMjE7Aa7voGAAw&usg=AFQjCNHubg54Y6WzMhN9IDRkuabiiHvD9Q&bvm=bv.47534661,d.ZGU)

I was able to setup a HTTP Retriever that gets values from counters from an IPX800 RTU (http://www.gce-electronics.com/fr/57-carte-8-relais-ethernet-ip-ipx800-v3.html);it works.

I want now to use a scripting datasource to do some calculation on this counters. I'm trying to calculate the power used every hours in kWh using the HTTP retreiver (DP_812785).
What ever I write in the script window and test I get the same error:


My debian install is in French. It looks like there is an internationalization issue but I don't really know where to look to solve the problem.

Thank you very much for your help

Here is an export of the scripting datasource:
"cronPattern":"0 0/15 * * * ?",
"script":"return p1.value;",