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TPS61099: Boost converter design

Part Number: TPS61099

Good morning, I am designing a boost converter that has an input voltage range between 2V and 3,5V from a 3V nominal lithium battery (the voltage range is considered to be the cut-off battery voltage and the maximum battery voltage) and an output of 4V with an output load current of 20uA. I have found the boost converter in object because it shows very low quiescent current and a good efficiency at light load that are the most important requirements to avoid an early battery discharge, But using the webbench tool , after setting the requirements above, the system gives me an error saying to change the input requirements... How about this problem? is the light load current a problem for the correct operation of the boost converter? (maybe the equivalent switching frequency is too low???).

Thank you.

Regards.