How to use handles/pathnames with "delete_line" function?

I have block handles and pathnames but delete_line function always gives the error of : "Invalid Simulink object handle". I mean I get handles and pathnames with "get_param" function so there should be no way of being them invalid.

I may be doing mistakes with using dots, paranthesis and brackets but matlab should give that error first, anyways here are my codes;

BlockHandle = get_param('DL/Subsystem/Subsystem', 'Handle');
Port = get_param('DL/Subsystem/Mux', 'PortConnectivity');       % Subsystem block connected to Mux block, from its input to Mux's output.
SourceHandle = get_param(Port(1,1).SrcBlock, 'Handle')          % Source is the block which connected to inport of Mux block.(Subsystem Block.) SourceHandle and BlockHandle is the same as they should be.
     delete_line = ('DL', 'Subsystem/1' , 'Mux/1')              % This deletes the line, but It doesn't delete the line in the subsystem "subsystem", 
%I work on a large file, so there may be so much more of this, I want to use handle or pathname because of this.
     delete_line = ('DL', (SourceHandle)/1, 'Mux/1              % Error : Invalid Simulink obejct handle.
%then tried this thought maybe If I can have the handle with port number there shouldn't be any error;
     k = get_param(SourceHandle, 'Ports')
     PortHandle = get_param(k(1), 'Handle')                      % Also Error : Invalid Simulink object handle.

I could'nt figure out how to do this. "Name/PortNumber" works but I have the same name repeatedly.. So I need to use handle or pathname, I tried pathname it is not happening neither.

I think there might be a mistake I do with brackets or dots while using delete_line.

Answer 1

[Burak Bayram]

Alternative Salvation for this problem;

using LineHandle, i.e.;

MuxLines =  get_param(allMuxes{1}, 'LineHandles');
%
InportLineHandle = MuxLines.Inport;
%
OutportLineHandle = MuxLines.Outport;
%
delete_line(InportLineHandle) && delete_line(OutportLineHandle)  %deletes all the lines before and after the "Mux".

But this is not the particular answer, I still appreciate the exact answer.