MATLAB: Problem with .mexw64 file

.mexw64

I'm tryngto simulite a simulink file that contains a state flow chart and the software gives me this error, how can i solve it?
Making simulation target "Step_5_sfun", ... 
C:\slprj\_sfprj\Step_5\_self\sfun\src>call "mexopts.bat"  
Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 
Copyright (C) Microsoft Corporation.  All rights reserved. 
### Compiling "Step_5_sfun.c" 
  cl.exe /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD   /I "C:\Program Files\MATLAB\R2011a\extern\include" /I "C:\Program Files\MATLAB\R2011a\simulink\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\mex\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\debugger\include"  "Step_5_sfun.c" 
Step_5_sfun.c 
### Compiling "Step_5_sfun_registry.c" 
  cl.exe /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD   /I "C:\Program Files\MATLAB\R2011a\extern\include" /I "C:\Program Files\MATLAB\R2011a\simulink\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\mex\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\debugger\include"  "Step_5_sfun_registry.c" 
Step_5_sfun_registry.c 
### Compiling "c1_Step_5.c" 
  cl.exe /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD /c /Zp8 /GR /W3 /EHs /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /nologo /MD   /I "C:\Program Files\MATLAB\R2011a\extern\include" /I "C:\Program Files\MATLAB\R2011a\simulink\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\mex\include" /I "C:\Program Files\MATLAB\R2011a\stateflow\c\debugger\include"  "c1_Step_5.c" 
c1_Step_5.c 
### Linking ... 
  link.exe /nologo /dll /OPT:NOREF /export:mexFunction  /OUT:Step_5_sfun.mexw64 /map:"Step_5_sfun.map"  "C:\Program Files\MATLAB\R2011a\stateflow\c\mex\lib\win64\sfc_mex.lib" "C:\Program Files\MATLAB\R2011a\stateflow\c\debugger\lib\win64\sfc_debug.lib"  "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libmx.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libmex.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libmat.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libfixedpoint.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libut.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libmwmathutil.lib" "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libemlrt.lib" "C:\Program Files\MATLAB\R2011a\lib\win64\libippmwipt.lib"   "C:\Program Files\MATLAB\R2011a\extern\lib\win64\microsoft\libmwblascompat32.lib" @Step_5_sfun.mol 
   Creating library Step_5_sfun.lib and object Step_5_sfun.exp 
  mt -outputresource:"Step_5_sfun.mexw64;2" -manifest "Step_5_sfun.mexw64.manifest" 
Microsoft (R) Manifest Tool version 6.1.7716.0  
Copyright (c) Microsoft Corporation 2009.   
All rights reserved.  
### Created Step_5_sfun.mexw64 
Make successful for machine: "Step_5"
moving Step_5_sfun.mexw64 from C:\slprj\_sfprj\Step_5\_self\sfun\src to C:\ failed.

Best Answer

Looks like a Windows UAC issue to me. Could you try running your model from a directory other than C:\ ? Perhaps Windows need administrator privileges to write to C:, which Simulink is attempting to do when it fails. Either work from a sub-folder of C: (but, outside of "Program Files"), or when you start MATLAB, right-click on the icon and "Run as administrator".
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