Problem in using a Mating Assembly Macro

Hi all

I was using this post :

to do some matings in Assembley , but whether I open a part or assembly I get a run time error 91 : Object variable or with block variable not set

I don't know in which line the set is not compatible with my assy, but I have chosen one of the components first ,only that I opened as Assembly that the parts already have a mating

is this a problem ?

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