MultiCharts: Trading Software for Automated Trading and Backtesting

Inputs:

MAType ( 0 ),
Length ( 20 ),
ConfirmBars ( 1 );

Variables:
MAValue ( 0 ),
NBars ( 0 );

switch (MAType)
begin

// 0 - SMA - Simple Moving Average
case 0:
MAValue = AverageFC(C, Length);

// 1 - SmMA - Smoothed Moving Average
case 1:
MAValue = SmoothedAverage(C, Length);

// 2 - TMA - Triangular Moving Average
case 2:
MAValue = TriAverage(C, Length);

default:
MAValue = AverageFC(C, Length);
end;

condition1 = C > MAValue;
if condition1 then
NBars = NBars + 1
else
NBars = 0;

condition1 = currentBar > ConfirmBars and NBars = ConfirmBars;
if condition1 then
buy ( "LE-Price-Over-MA" ) next bar at market;

Ok I have simplified my code, here is the buggy part.

It's the code of a signal, when I want to optimize it (Length from 4 to 100), I got the following error: "Array bounds. Wrong index value: 51"

Inputs:

MAType ( 0 ),
Length ( 20 ),
ConfirmBars ( 1 );

Variables:
MAValue ( 0 ),
NBars ( 0 );

switch (MAType)
begin

// 0 - SMA - Simple Moving Average
case 0:
MAValue = AverageFC(C, Length);

// 1 - SmMA - Smoothed Moving Average
case 1:
MAValue = SmoothedAverage(C, Length);

// 2 - TMA - Triangular Moving Average
case 2:
MAValue = TriAverage(C, Length);

default:
MAValue = AverageFC(C, Length);
end;

condition1 = C > MAValue;
if condition1 then
NBars = NBars + 1
else
NBars = 0;

condition1 = currentBar > ConfirmBars and NBars = ConfirmBars;
if condition1 then
buy ( "LE-Price-Over-MA" ) next bar at market;

Why do I got this error?
(I have MC 7.2)

Ok so,

here the results of my testing:

1.
No error with if/else if/else with AverageFC
Error with switch and AverageFC

2.
No error with if/else if/else with Average
No error with switch and Average

I do not understand why there is a difference for the first case.
Why the switch is interpreted differently of a if/else if/else??

Should I report it?

Ok so,

here the results of my testing:

1.
No error with if/else if/else with AverageFC
Error with switch and AverageFC

2.
No error with if/else if/else with Average
No error with switch and Average

I do not understand why there is a difference for the first case.
Why the switch is interpreted differently of a if/else if/else??

Should I report it?