Description
Item IDs must be available. The item ID you provided already exists in your organization.
The <value> parameter refers to the item type.
The second <value> parameter refers to the item ID.
Solution
Provide an available item ID. It must contain 32 alphanumeric values ranging from the letters a to f and numbers 0 to 9. Alternatively, you can choose not to provide item IDs; IDs will be automatically assigned.
See Upload Service Definition for more information.