This error occurs when ISE is unable to find or launch the executable created by the ISim compiler (fuse). In the example above, sim_isim_beh.exe is the executable that should be ran to view the ISim GUI. Howeverthe following conditions can result in the following error:
1) A stale simulation executable (sim_isim_beh.exe, in this example)is running in the background.
Resolution: Open Task Manager or "top" in Linux and terminate the process associated with the executable. Alternatively, you can restart your machine to terminate all stale processes.
2) An error occurred while compiling the sources (fuse error)
Resolution: Open the compiler log file (fuse.log) available in the project directory. If an error is shown in the report, use keywords in the error to search for known issues and solutions in
www.xilinx.com 3) In some circumstances, a project corruption can lead to this situation.
Resolution: Use the "Generate Tcl Script" feature in the Project menu to generate a Tcl script that can rebuild the project. Use the following line in your command prompt / terminal window to rebuild the project
xtclsh <tcl_file>.tcl rebuild_project
For more assistance with this error, contact Xilinx Technical Support using the contact methods at
www.xilinx.com/support.