pathfinding though fun can be a little tricky to get right tolerences are verry fine just double check piece by peice is my best advice should it not work

While trying to do pathfinding I am getting this message when looking for linkset Error detected while querying for pathfinding linksets

any ideas how to fix it?

Desy,
I hope you got an answer and that it just wasn't posted here. I am sorry if you have not, I do not see one. I would venture to guess that you had already looked at the Pathfinding section here within the Mossm website so maybe one of these will help:
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http://wiki.secondlife.com/wiki/Pathfinding_Quick_Start_Guide
http://wiki.secondlife.com/wiki/Pathfinding_Tools_in_the_Second_Life_Viewer
http://wiki.secondlife.com/wiki/Viewerhelp:Pathfinding_linksets
http://wiki.secondlife.com/wiki/Good_Building_Practices
http://blog.nalates.net/2012/08/08/second-life-pathfinding-performance
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I am not trying to imply anything here and I recognize that you had most likely depleted all other options and had already seen these links. I just find it a little sad to see no response to your question. I hope that if your question is still open, something within one of these pages will help. Best of luck to you in every situation that comes your way.