Two issues building indicator,

[Conceptzx]

In an effort to consolidate my custom and some other MA indicators, I'm trying to build one that makes it easier to select. I've run into 2 problems, I cannot call on the indicator I have in my custom folder and I cannot get bollinger or keltner bands to display, only envelopes work.

Right now, only Line 90 Column 60 is displaying a compile error, that's the indicator in the custom folder, the others are disabled. When I select Bollinger or Keltner, I have no output to the chart.

I don't need it fixed but If somebody could explain what I'm missing so I can learn a little more, I'd appreciate it.

[bltdavid]

Here is what I see at a quick glance.

Bollinger suffers because stdDev is never assigned a value.

Keltner suffers because on the very first bar of the chart,
accessing the previous bar High[1] and Low[1] is an error.

-=o=-

The very first bar has no previous bar, that's why you'll see
guard code (usually at the top of OnBarUpdate) like,

if (CurrentBar < 1)
    return;

Why does this code work?
Because the very first bar has CurrentBar value of 0, this
guard says only process when you have at least one bar on
the chart, which is what your code needs to access the
previous bar.

How did I know to use '1' in 'CurrentBar < 1'?
Because '1' was the highest index your code ever used when
accessing series values of prior bars.