'The given key was not present in the dictionary' - Why this error happend???

A few moments ago visual basic .net send me this error: 'The given key was not present in the dictionary'

The problem was in this function:
    Private Delegate Sub delegate_crea_dispositivos(ByVal titulo As String, ByVal titulo1 As String, ByVal indice As String, ByVal indice1 As Integer)
    Private Sub crea_dispositivos(ByVal titulo As String, ByVal titulo1 As String, ByVal indice As String, ByVal indice1 As Integer)
        If Me.InvokeRequired Then
            Me.Invoke(New delegate_crea_dispositivos(AddressOf crea_dispositivos), titulo, titulo1, indice, indice1)

            paso_medio_graficas(titulo, titulo1, indice, indice1)
            FillData_dispositivos(indice, indice1)
        End If
    End Sub

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when the program came to this line:  If Me.InvokeRequired Then fire up the error

The details of the exception was:
No se controló System.Collections.Generic.KeyNotFoundException
  Message="La clave proporcionada no se encontró en el diccionario."
       en System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
       en System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
       en _2bocas.grafica_p6.crea_dispositivos(String titulo, String titulo1, String indice, Int32 indice1) en D:\PROYECTOS\PROGRAMACION\PROYECTO 2BOCAS\2bocasfisicas\ddlabv6\version3\2bocas\grafica_p6.vb:línea 190
       en _2bocas.grafica_p6.tuberia_crudo() en D:\PROYECTOS\PROGRAMACION\PROYECTO 2BOCAS\2bocasfisicas\ddlabv6\version3\2bocas\grafica_p6.vb:línea 142
       en System.Threading.ExecutionContext.runTryCode(Object userData)
       en System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       en System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       en System.Threading.ThreadHelper.ThreadStart()

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unfortunately I dont save the error message and I cannot reproduce it again

I fix this problem by deleting the code of the function and write it again

But just for my knowledge why that error happend I why I fix the problem write it again the function
Who is Participating?
aprestoConnect With a Mentor Commented:
The reason an error like this occurs is if you are trying to access an entry in a collection which doesnt exist. For example, lets say you have an array/collection with the following entries:

MyArray[0] = Peter
MyArray[1] = John
MyArray[2] = Paul

And you try to reference MyArray[3], you will get a similar error because you are referencing an entry which doesnt exist. The reason you are getting "The given key doesnt exist" is because you must be trying to reference a collection of Key/Value pairs. But the same principle applies. This normally occurs in a loop. It's more difficult to debug in a multithreaded application.

Try setting break points before the error occurs and stepping through your code.

Does this explanation as to why the error occurs make sense?
altariamx2003Author Commented:
It happend again

this is the error message
altariamx2003Author Commented:

It make sense

And I found that the problem was an Array inside "FillData_dispositivos"

Thanks a lot for your help!!!!
No problem, I'm glad I could help

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