The following error is reported during evaluate process when exporting RTL.
>xtclsh run_ise.tcl || exit $?
ERROR:TclTasksC - ERROR:TclTasksC:project_028 - project set : Unknown property
Type [project properties] for more information.
@E [IMPL-249] Errors occurred while synthesizing the design: ERROR:TclTasksC:project_030 - project set: Cannot set "Device Family=aspartan6"
@E [IMPL-2] Implementation with tool 'ISE' failed.
This error indicates the implementation tool invoked is incompatible with the selected device, most likely an earlier version of the tool which does not support the targeting device. Verify that the environment variable is set up correctly to point to the desired implementation build.