s function feedthrough problem

Good morning for everybody. first of all excuse me for my english.

I am working with S-functions and everything is going ok but suddenly matlab crashes and it give me this error:

------------------------------------------------------------------------------------------------------------------------------------------- _This error was detected while a MEX-file was running. If the MEX-file is not an official MathWorks function, please examine its source code for errors. Please consult the External Interfaces Guide for information on debugging MEX-files.

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Thank you for your help. MATLAB may attempt to recover, but even if recovery appears successful, we recommend that you save your workspace and restart MATLAB as soon as possible.

------------------------------------------------------------- This segmentation violation occurred while executing the S-function 'DI1' in block 'simulador_tren/VarDBs/DI'. A common cause of this segmentation violation is an incorrect input port direct feedthrough setting. Each input port of the S-function that is read (accessed) in mdlOutputs and/or mdlGetTimeOfNextVarHit must specify that it needs its input signal in these routines by setting direct feedthrough for these input ports. 1) To debug your C-MEX S-function, you can enable diagnostics by compiling the S-function source with the -g flag, e.g., mex -g sfunction_name.c 2) You can ask Simulink to try assuming your S-function has direct feedthrough using: set_param('modelname','TryForcingSFcnDF','on') If Simulink can find a valid sorting mode that does not result in algebraic loops involving your S-function, your model will execute (assuming that the cause of this segmentation violation is an incorrect direct feedthrough setting on an input port). See matlabroot/simulink/src/sfuntmpl_directfeed.txt ------------------------------------------------------------- -----------------------------------------------------------------------------------------------------------------------------------_

I don`t understand why it gives me this error after 600 seconds working fine. All the inputs in the S-function has the direct feedthrough on true. Using other S-function everything is fine but with this i have this error. Please help me because i cannot understand it. thanks.

[Yongliang Lee]

yeah，good friend，have you handled this problem？