Error: The Matlab array must either be a cell array or a double precision matrix

I have compiled lbfgsb on Linux for Matlab. and trying to run the example

with the translation of

using MATLAB

x0  = [-3  -1  -3  -1];   #% The starting point.
lb  = [-10 -10 -10 -10];  ##% Lower bound on the variables.
ub  = [+10 +10 +10 +10];  #% Upper bound on the variables.

mat """
	$x = lbfgsb_mex($x0,$lb,$ub,'computeObjectiveHS038','computeGradientHS038',...
           [],'genericcallback','maxiter',80,'m',4,'factr',1e-12,...
           'pgtol',1e-5);"""

but got the error

 Error using lbfgsb_mex
The Matlab array must either be a cell array or a double precision matrix
 
Error using save
Variable 'jx_lbfgsb_mex_arg_out_1' not found.
 
ERROR: MATLAB.MEngineError("failed to get variable jx_lbfgsb_mex_arg_out_1 from MATLAB session")
Stacktrace:
 [1] get_mvariable(::MATLAB.MSession, ::Symbol) at /home/myname/.julia/v0.6/MATLAB/src/engine.jl:162
 [2] mxcall(::MATLAB.MSession, ::Symbol, ::Int64, ::Array{Int64,1}, ::Vararg{Any,N} where N) at /home/myname/.julia/v0.6/MATLAB/src/engine.jl:291
 [3] mxcall(::Symbol, ::Int64, ::Array{Int64,1}, ::Array{Int64,1}, ::Vararg{Any,N} where N) at /home/myname/.julia/v0.6/MATLAB/src/engine.jl:315

Can anyone shed light on this problem? Simple passing the arrays into matlab and get values out of it are working fine, the error occurs when I try to call the lbfgsb_mex. Note that the other calls i.e. svd, sum in MATLAB work fine.

Reproduce the failure with src/examplehs038.m and the lbfgsb_mex call, then inspect MATLAB/src/engine.jl at lines 162, 291, and 315 alongside the reported stack trace. Trace how the lbfgsb_mex arguments and return value are transferred through the MATLAB engine; done means the example runs without the array-type or missing-variable errors.