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AR# 17960

6.1i ISE - Closing Project Navigator produces a runtime error


General Description:

When I close Project Navigator, the following error appears:

"Runtime Error!

Program: c:\Xilinx\bin\nt\_pn.exe

This application has requested the Runtime to terminate it in a unusual way. Please contact the application's support team for more information."


This error can occur if an attached process (such as CORE Generator, Architecture Wizard, FPGA Editor, or PACE) cannot be shut down when Project Navigator is shutting down. To avoid the error, make sure that all programs called from within Project Navigator are closed before you shut down Project Navigator.

This problem has been fixed in the latest 6.1i Service Pack, available at:

The first service pack containing the fix is 6.1i Service Pack 1.
AR# 17960
Date Created 09/03/2007
Last Updated 10/26/2010
Status Archive
Type General Article