The procedure is simple:
1.Declare the variable in app/program wherever you want based on function call.
2.Goto IO card and browse the variable path.
In you case you have copied and pasted the path but not exist application/program
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As per the attached error document it seems to be that the variable is not defined in the application,So define the variable in the application then connect the same variable to the AI830 module of the particular channel.