General description: Flow engine terminated in translate(ngdbuild) or place & route(par) with ERROR: basut -switch "-<option>" is excluded or already used.
Solution
Your custom option(s) might conflict with option(s) already specified by widgets in the templates. You can examine the command line options by selecting utilities->command preview from flow engine window. If you have a conflict, remove the customized option.
For adding and checking command line arguments in ISE, please see (Xilinx Answer 11088).