[cxfchinacxf]

在使用RTW将Simulink模型生成C代码过程中产生了一个错误，经过一段时间的修改还是没有用，希望有会的达人帮忙看看，谢谢！
在设定参数时
Solver:Simulation time
Start time:0.0 Stop time:inf
Solver options
Type:Fixed-step ode5(Dormand-Prince)
WorkspaceI/O:Time与Output选中
Real-Time Workshop
Category:Target configuration
Configuration
System target file:Visual C/C++Project Makefile only for the "grt" target
之后点击Build就产生如下的错误:
Error executing build command: Error using ==> make_rtw
Error using ==> d:/matlab2006/toolbox/rtw/rtw/private/issue_inv_comp_env_val_error
Invalid setting for environment variable MSDevDir or DevEnvDir.
The setting is: ''
You can verify the setting by checking for the existence of:
%MSDevDir%\..\vc\bin\vcvars32.bat (for Visual C/C++ 5.0)
%MSDevDir%\..\..\vc98\bin\vcvars32.bat (for Visual C/C++ 6.0)
%DevEnvDir%\..\tools\vsvars32.bat (for Visual C/C++ 7.0)

You must define MSDevDir or DevEnvDir to be:
set %MSDevDir%=<VisualRoot>\sharedide (for Visual C/C++ 5.0)
set %MSDevDir%=<VisualRoot>\common\msdev98 (for Visual C/C++ 6.0)
set %DevEnvDir%=<VisualRoot>\common7\ide (for Visual C/C++ 7.0)

This error may be due to an invalid preference file:
C:\Documents and Settings\cxf\Application Data\MathWorks\MATLAB\R13\mexopts.bat
Please run "mex -setup" at the MATLAB prompt to correct