Donīt understand error message

[granite11]

Hi,

I donīt understand why this does not work:

   if (CrossAbove(DTest_Trading(period).Plot0[0], 0, 1));
            {
                EnterLong();
            }

D_Test_Trading is a simple indicator Iīve built on my own, .Plot0[0] is the current value of the indicatorīs line. NT gives me error codes CS 1502 and CS 1503 (issues with converting data type etc.). Usually an indicator can cross a double or int number using CrossAbove(). Whatīs wrong?
Thanks!

[NinjaTrader_Bertrand]

The first one should be a dataseries and you're submitting a double, thus please remove the index and retry -

http://www.ninjatrader-support.com/HelpGuideV6/CrossAbove.html