sample barchart application runs but it's blank

[arashaga]

I can run the sample barchart from here without errors but whe I test it, it only shows the texts of field that I choose and does not show the barcharts. Also, i tried that debugger and @logexception decorator acording tot he instruction in the other post and can't get the debuger spit out anything. Can someone please help me how to figure this out? Thanks.