using the same motor twice in scan
I think there should be a better error message than the one below when using the same motor twice in a scan.
TEST_SESSION [15]: s=a2scan(roby,-.3,.5,roby,-.5,.3,20,.1,sim_ct_gauss)
!!! === AttributeError: 'str' object has no attribute 'name' === !!! ( for more details type cmd 'last_error'