[galaxy-dev] Sort tab error?

Hi, I always get this error when I use Sort feature *"An error occurred running this job: sort: multi-character tab `$\t'"* Even I already use Text Manipulation->Convert to convert my table to Tabs format. Here is the screenshot of what happen (I want to sort C2 on job #12) : http://img408.imageshack.us/img408/7906/screenshotbu.png Could someone please show me how to fix this? Thank you.