I have a new toolflow installation on Linux. 
When I use the yellow blocks in my Simulink 
models and run a simulation, I get the error 
message 

"All Xilinx Blocks must be contained in a level of hierarchy with a
System Generator Token"

from the DefaultBlockDiagram. All the Xilinx 
blocks I add are in the same hierarchy level 
with a System Generator token. What causes 
this error message? How do I fix this? 




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