Collections help please

[johnnyboy23]

adding collections.
i have added a collection to my project in a class module
but i get errors when trying to run it
what am i doing wrong help me please???

Private colDetails As New collection
'then using a function
 colDetails.add newDetail, CStr(.id)
'and i get a runtime error '457'
'the key is already associated with an element of this 
'collection any ideas what that means????

Can you give more detail. What is newDetail and .id

[vbmom]

Look at the syntax def for the add method in collections. The index field must be unique. You're adding an existing index.

[honeybee]

Whatever is the value of the CStr(.ID) has already been used with some other item, I think. The index of the item to be added has to be unique.

If this is the problem, try to add elements with a unique index, or try to generate an index whenever an item is added to the collection.