how to resolve an error mes like the one below?

Interface error:failed to resolve data 'y1' in chart to a valid simulink.singnal object.

[Walter Roberson]

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Answer 1

[Walter Roberson]

It means you use "y1" as an input signal to the chart, but your model does not define y1 .

[Michael Hodgson]

Could you be a bit more specific? I'm getting a similar error, "Failed to resolve data 'u1' in 'Matlab function for u1.' to a valid Simulink.Signal object."

where "Matlab function for u1" is a Matlab function block ( http://au.mathworks.com/help/simulink/ug/creating-an-example-model-that-uses-a-matlab-function-block.html ), and "u1" is the output from the block. The fn block thus creates the variable "u1," so your answer, "your model does not define y1" doesn't seem to apply here.

[Walter Roberson]

Could you confirm that your situation is that you are using a MATLAB Function Block in Simulink, and that you used one of the ways mentioned at https://www.mathworks.com/help/simulink/ug/signal-basics.html to name the output signal u1 ? And that signal is being routed into a Stateflow diagram, and is being referred to using the name u1 inside the Stateflow diagram ?