subroutine history outputkeywords how can I output the state-dependent variables when using subroutine Vfriction? 

I used to trying make it in the 'keywords' about my model,but it said "Output request SDV1 and SDV2 is not available for this option"    even I chang the SDV1 and SDV2 to SDV laterly.

Detailed pictures are listed below.

Thanks!!!

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