"Object reference not set to an instance of an object" error while placing user defined content in GC+AECOsim

Hej ppl,

I am trying to some user defined items in GC, but I always get this error: Object reference not set to an instance of an object.

lets say in GC/AECOsim,  i defined a coordinate system cs01.

I can use cs01 to place doors (fx, door01), directly from GC AECOsim Building Designer menubar, and I just need to draw a wire from cs01 to input of door01, and choose the catalogitem types from the dropdown list. no problems at all.

now I have used revit to gerenrate some my own catalogitems fx, item1, they can be manually placed by place user defined content.

if I use GCs function place BuildingContent (fx, BldCt01), it asks for the same input as doors. but if I draw a wire from cs01 to BldCt01.CoordinateSystem, and choose item1. I get this error Object reference not set to an instance of an object.

I have tried to simplfy the design, it contains only one coordinate system cs01 (placed manually), and on BuildingContent, still gets the error.

I have attached a screenshot of my orginal designfile, I create a serie of coordinatesystem, and wish could use them to place my item1(gerenated in revit).... the coordinatesystem is working if i use it to place doors.

could anyone help me with the issue?? thx

Leo

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