Recommendation engine (Smart Acceleration) throwing error "Unable to substitute parameter <>"

When using the recommendation wizard, you might see status error like the one shown below whereby the system is unable to make a recommendation for specific visual.

This is usually because you are using custom expression with parameters in the visuals. If you do not specify default value I believe that’s when you see that error.

<<parameter : default value>>

Best to always specify a default value for example:

This will allow the system to properly evaluate the visual expression and provide a recommendation as shown here:

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