Are you ewrapping your cast on? If you are you need to place your weaving brushes on for about 5 rows and pull your needles out to the hold position, that's as far as they will pull out, each row for about 5 rows. Then you should be able to turn off the weaving brushes.
If you are using a different cast on such as pulling out the needles you want to use, then return everyother needle to hold position, all the way out, take your yarn and place it over the needles in hold and with your weaving brushes on knit one row. Leave your weaving brushes on for a few rows before taking them off.
Hope this helps, don't give up, you will get it to work.