Hi,
I am using the command line to run app2 to trace neuron with vaa3d. I follow this page: https://github.com/Vaa3D/Vaa3D_Wiki/wiki...
Based on the help, to call app2 in terminal we should write:

>> vaa3d -x plugin_name -f app2 -i -o -p vaa3d -x plugin_name -f app2 -i -o -p [inmarker_file [channel [bkg_thresh [b_256cube [b_RadiusFrom2D [is_gsdt [is_gap [length_thresh [is_resample][is_brightfield][is_high_intensity]]]]]]]]]

where -p is for the parameters. When I run it without parameters, it chooses default values and works well. But when I set the parameters and put inmarker_file=NULL, it does not work. 

Would appreciate your help.