Index operation failed; the array index evaluated to null.
At line:32 char:9
+         $dureeNote = $durees[$ligne.DuréeNote]
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArrayIndex
 
Exception calling "Beep" with "2" argument(s): "Positive number required.
Parameter name: duration
Actual value was 0."
At line:35 char:9
+         [console]::beep($frequenceNote, $dureeNote)
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentOutOfRangeException
 
Start-Sleep : Cannot validate argument on parameter 'Milliseconds'. The argument is null, empty, or an element of 
the argument collection contains a null value. Supply a collection that does not contain any null values and then 
try the command again.
At line:39 char:39
+             Start-Sleep -Milliseconds $ligne.DuréePause
+                                       ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Start-Sleep], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.PowerShell.Commands.StartSleepCommand