This message is generated by an attempt to change the context of a symbol to a context that already contains a symbol with the same name. When this error occurs, the context is not changed.
The context of a symbol sym can be changed by making an assignment to Context[sym].
Off[message] switches off the message; On[message] switches it on. For example: Off[Context::cxdup].
Examples
Basic Examples(1)
This error message occurs because there is already a symbol with the new name and context: