We figured out the cause of this error.  I had a block called 'vector_sink2' .  
I also have blocks called vector_sink. Turns out the block naming simply 
appends the block's index to it.  
The first vector_sink2 gets called vector_sink21
The first vector_sink gets called vector_sink1
So at some point we got an additional 20 vector_sink blocks.  So that created a 
'vector_sink21', which had a name conflict with the first vector_sink2.
The moral of the story is not to end the block name with a number.  An even 
better idea is to add a separator after the block name and its index for the 
complete name: e.g. vector_sink2(1)


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