The problem here is caused by adding a poser runtime to poser 12 which has dson added as an addon. the best cure I have heard about for this, ( I believe from Snarlygribbly ) is to create a new runtime and move your addons into it. Add that runtime to poser 11, but do not add it to poser 12, your dson will continue to work in poser 11 and will not cause errors in poser 12.

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