SPECTQL charting

[lievenjanssen]

How can I create a chart on top of SPECTQL with specific charting url params, following url gives error:

http://data.appsforghent.be/spectql/TDTStats/Year/all/all/2012%7Bmonth-,requests%7D:column?category=month&value=requests

Error: Could not process this token: Parse Error: ('?')() not expected