Issue with function arguments

[henry2004y]

I have encountered an issue using boundary function from Matlab.

using MATLAB
x = rand(30);
y = rand(30);
k = mxcall(:boundary, 2, x, y) # This works fine
k = mxcall(:boundary, 3, x, y, 1.0) # This would return error

The error messages are:

Error using boundary (line 54)
Too many output arguments.
 
Error using save
Variable 'jx_boundary_arg_out_1' not found.
 
ERROR: MATLAB.MEngineError("failed to get variable jx_boundary_arg_out_1 from MATLAB session")
Stacktrace:
 [1] get_mvariable(::MSession, ::Symbol) at /Users/hyzhou/.julia/packages/MATLAB/cVrxc/src/engine.jl:164
 [2] mxcall(::MSession, ::Symbol, ::Int64, ::Array{Float64,1}, ::Vararg{Any,N} where N) at /Users/hyzhou/.julia/packages/MATLAB/cVrxc/src/engine.jl:297
 [3] mxcall(::Symbol, ::Int64, ::Array{Float64,1}, ::Array{Float64,1}, ::Vararg{Any,N} where N) at /Users/hyzhou/.julia/packages/MATLAB/cVrxc/src/engine.jl:317
 [4] top-level scope at none:0

My feeling is that the boundary function accepts different sets of input arguments which confuses Julia. How can we solve this?