No matching constructor signature

Hi there,

I got a question about opening a simulink model. Since some time I get the warning in MATLAB:

Warning: Simulink.ModelWorkspace object could not be loaded because of error:
 No matching constructor signature. 
> In load_system at 21
  In myInnerFunction at 61
  In myOuterFunction at 343

Unfortunately, I can't really tell since when I get this warning. Does anyone understand what it means and how it can be correted? Googleing for this error has not shown me anything useful. I'm using two C-Mex S-functions to simulate a dynamical system. Besides that, there is nothing fancy in it but this is the only simulink model where this happens.

Thanks for any advice.

==========================================================================

ver command:

MATLAB Version 7.13.0.564 (R2011b)
MATLAB License Number: *******
Operating System: Linux 2.6.39-generic64-isg-ee-smp-3 #1 SMP Wed Jan 18 10:58:52 CET 2012 x86_64
Java VM Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
-------------------------------------------------------------------------------------
MATLAB                                                Version 7.13       (R2011b)
Simulink                                              Version 7.8        (R2011b)
Aerospace Blockset                                    Version 3.8        (R2011b)
Aerospace Toolbox                                     Version 2.8        (R2011b)
Bioinformatics Toolbox                                Version 4.0        (R2011b)
Communications System Toolbox                         Version 5.1        (R2011b)
Computer Vision System Toolbox                        Version 4.1        (R2011b)
Control System Toolbox                                Version 9.2        (R2011b)
Curve Fitting Toolbox                                 Version 3.2        (R2011b)
DSP System Toolbox                                    Version 8.1        (R2011b)
Database Toolbox                                      Version 3.10       (R2011b)
Datafeed Toolbox                                      Version 4.2        (R2011b)
EDA Simulator Link                                    Version 3.4        (R2011b)
Econometrics Toolbox                                  Version 2.0.1      (R2011b)
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Financial Toolbox                                     Version 4.1        (R2011b)
Fixed-Income Toolbox                                  Version 2.2        (R2011b)
Fixed-Point Toolbox                                   Version 3.4        (R2011b)
Fuzzy Logic Toolbox                                   Version 2.2.14     (R2011b)
Global Optimization Toolbox                           Version 3.2        (R2011b)
Hybrid Toolbox                                        Version 1.2.5      -       
ICTools                                               Version 6.0W               
Image Acquisition Toolbox                             Version 4.2        (R2011b)
Image Processing Toolbox                              Version 7.3        (R2011b)
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MATLAB Builder JA                                     Version 2.2.3      (R2011b)
MATLAB Coder                                          Version 2.1        (R2011b)
MATLAB Compiler                                       Version 4.16       (R2011b)
MATLAB Report Generator                               Version 3.11       (R2011b)
Mapping Toolbox                                       Version 3.4        (R2011b)
MatLab Geodetic Toolbox                               Version 2.92a              
Model Predictive Control Toolbox                      Version 4.0        (R2011b)
Multi-Parametric Toolbox                              Version 2.6.3      (R2008a)
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Parallel Computing Toolbox                            Version 5.2        (R2011b)
Partial Differential Equation Toolbox                 Version 1.0.19     (R2011b)
RF Toolbox                                            Version 2.9        (R2011b)
Robust Control Toolbox                                Version 4.0        (R2011b)
Signal Processing Toolbox                             Version 6.16       (R2011b)
SimBiology                                            Version 4.0        (R2011b)
SimDriveline                                          Version 2.1        (R2011b)
SimElectronics                                        Version 2.0        (R2011b)
SimEvents                                             Version 4.0        (R2011b)
SimHydraulics                                         Version 1.10       (R2011b)
SimMechanics                                          Version 3.2.3      (R2011b)
SimPowerSystems                                       Version 5.5        (R2011b)
SimRF                                                 Version 3.1        (R2011b)
Simscape                                              Version 3.6        (R2011b)
Simulink 3D Animation                                 Version 6.0        (R2011b)
Simulink Coder                                        Version 8.1        (R2011b)
Simulink Control Design                               Version 3.4        (R2011b)
Simulink Design Optimization                          Version 2.0        (R2011b)
Simulink Fixed Point                                  Version 7.0        (R2011b)
Simulink Report Generator                             Version 3.11       (R2011b)
Simulink Verification and Validation                  Version 3.2        (R2011b)
Stateflow                                             Version 7.8        (R2011b)
Statistics Toolbox                                    Version 7.6        (R2011b)
Symbolic Math Toolbox                                 Version 5.7        (R2011b)
System Identification Toolbox                         Version 7.4.3      (R2011b)
Wavelet Toolbox                                       Version 4.8        (R2011b)
YALMIP                                                Version 3          (R2009b)

Answer 1

[Kaustubha Govind]

Could you try running "rehash toolboxcache" at the MATLAB prompt and try calling load_system again? Does the warning go away?

Answer 2

[xlr8t]

Hi, thanks for your answers. Unfortunately, I'm not able to post my files in public and I hoped that someone knows about this warning. When I start the simulation in debugger mode the load_system command gets called and the only variable is then 'sys' containing the simulink model name as a string. Then on line 21

open_system(sys, 'loadonly');

gets called and then two variables exist in the called function:

function varargout = slprivate(function_name, varargin)

function_name and varargin

function_name contains the string 'slautosave' and varargin contains a string 'tofront' and an empty string. Then the function

[varargout{1:nargout}] = feval(function_name, varargin{1:end});

is called and the debugger returns to 'load_system' and now I have the variables sys with the name of the model plus the variable ans == 1. The funny thing is, when I run the simulation in the debugger mode the warning does not pop up. And any subsequent normal call of the simulation file does also not show this warning. But if I restart Matlab it comes again.

I also tried the suggestion from Kaustubha and that works as well. The warning disappears. But as soon as I restart Matlab it comes again.

Could anyone of you tell me why that could be? Thanks a lot for your advice!

[Kaustubha Govind]

What about if you run "rehash toolboxcache" after starting MATLAB in "Run as adminstrator" mode? Does the warning go away in subsequent MATLAB sessions?

[xlr8t]

Sorry it took me so long. I couldn't look into that for a while.

I'm working on linux so there is no 'Run as administrator' but I guess sudo xyz would be somehow equivalent. I never tried to run matlab with sudo before but strangely that doesn't even work:

sudo: matlab: command not found

If I execute 'rehash toolboxcache' right after starting MATLAB it has no effect and the warnings will pop up but once I ran the simulation and then execute 'rehash toolboxcache' it will make it goe away for the whole MATLAB session.

I really have no clue what this is about. I don't even understand what the warning means. Thx

[Kaustubha Govind]

Hmm.. I don't know enough about Linux to tell why "matlab" can't be started with sudo. I would recommend contacting MathWorks Tech Support also to check if they have a better solution.

Answer 3

[Ujala Nadeem]

hey can anybody tell me why i am getting this "invalid constructor signature" error during arduinosetup in MATLAB. I am doing it to make the communication between arduino and MATLAB because i am inteded to take the values in simulink from an accelerometer which is connected with the arduino. Please help i am stuck with this.