You got one! I susoect that the problem may have been the two words that you placed in the opening bracketed expression, but bI'm not positive. Or it may have been the two rolls.
[roll=test]1d20+5;1d6+2[/roll]
[roll0][roll=test2]1d6_2[/roll]
looks like I missed the plus sign. happens to me more than I care to admit.
Maybe 2 rolls would work if you separated them with a comma?