help with error meesage

I have a mapping application with a functioning datagrid and relates and both are working well. I do have the following error popup when selecting clicking the relate icon for one of the points:

Unexpected K encountered at location 2

I have looked but could not find any suitable answer as everything seems to be operating normal when I select other points and thier respective relates.

This relate seems to works fine in ArcMap.

Any help, hints or suggestions would be appreciated.

James Armstrong