Build procedure error; CGIR assertion failed. What does it mean?

I try to build a model with R2011b for Generic Real-Time target(grt).

This is the error message I received:

### Starting build procedure for model: my_model
### Generating code into build folder: C:\Users\my_path\my_model\my_model_grt_rtw

CGIR assertion 'fLength == selRegions.getLength()' failed in '.\dom_core\lowering\ScalarizeVcat.cpp:920'
[  0] 0x572a5017 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+01789975 ( CG::isVcatScalSuppAutoVerifierCheckExpr+004247 )
[  1] 0x572a5b87 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+01792903 ( CG::isVcatScalSuppAutoVerifierCheckExpr+007175 )
[  2] 0x572a5ec5 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+01793733 ( CG::isVcatScalSuppAutoVerifierCheckExpr+008005 )
[  3] 0x5715b46c C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+00439404 ( CG::transform::ScalVcat::processFcn+000012 )
[  4] 0x571547e6 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+00411622 ( CG::FcnTransform::apply+000086 )
[  5] 0x5715488a C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+00411786 ( CG::FcnTransform::processScopeWithService+000074 )
[  6] 0x5715b915 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\cgir_xform.dll+00440597 ( CG::ScopeTransform::apply+000053 )
[  7] 0x575fd01a C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\rtwcg.dll+00708634 ( RTWCG::RTWFcnConst::CommonTransformsToOptimizeAndEmitCode+003530 )
[  8] 0x575ff4ad C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\rtwcg.dll+00717997 ( RTWCG::RTWFcnConst::OptimizeAndEmitCode+003101 )
[  9] 0x575c085d C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\rtwcg.dll+00460893 ( RTWCG::RTWCGModule::OptimizeAndEmitCode+000125 )
[ 10] 0x59b99ecd C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\libmwsimulink.dll+08298189 ( BlockSetCheckVarDimsInputEmpty+066381 )
[ 11] 0x59b96f97 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\libmwsimulink.dll+08286103 ( BlockSetCheckVarDimsInputEmpty+054295 )
[ 12] 0x59beaa02 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\libmwsimulink.dll+08628738 ( sleGetRTWBlockForSLBlock+262210 )
[ 13] 0x59beaf9f C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\libmwsimulink.dll+08630175 ( sleGetRTWBlockForSLBlock+263647 )
[ 14] 0x596db9c5 C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\libmwsimulink.dll+03324357 ( ArrayToSLObject+481685 )
[ 15] 0x025fea8c C:\Program Files (x86)\MATLAB\R2011bSP1\bin\win32\m_dispatcher.dll+00060044 ( mdLogging::log_function_exit+000108 )
### Build procedure for model: 'my_model' aborted due to an error.
Error using tlc_c (line 174)
Unexpected or internal error encountered in "in CGIR: .\dom_core\lowering\ScalarizeVcat.cpp line 920: fLength == selRegions.getLength()
".  Please report this to MathWorks if you can cause it to recur

Error in RTW.makertw/make_rtw (line 281)
          buildResult = tlc_c(h,...

Error in make_rtw (line 22)
buildResult = h.make_rtw(varargin{:});

Error in C:\Program Files (x86)\MATLAB\R2011bSP1\toolbox\simulink\simulink\private\build_target.p>RunBuildCmd (line 94)

Error in C:\Program Files (x86)\MATLAB\R2011bSP1\toolbox\simulink\simulink\private\build_target.p>build_target (line 6)

Error in C:\Program Files (x86)\MATLAB\R2011bSP1\toolbox\simulink\simulink\private\build_standalone_rtw_target.p>build_standalone_rtw_target (line
56)

Error in C:\Program Files (x86)\MATLAB\R2011bSP1\toolbox\simulink\simulink\private\slbuild_private.p>loc_codegenentry (line 591)

Error in C:\Program Files (x86)\MATLAB\R2011bSP1\toolbox\simulink\simulink\private\slbuild_private.p>slbuild_private (line 335)

Error in sl (line 16)
[varargout{1:nargout}]=feval(varargin{:});

Error in slbuild (line 62)
    sl('slbuild_private', mdl, varargin{:});

Answer 1

[Suneesh]

CGIR assertions indicate an issue/bug with the code generation engine used. If this is NOT a custom block and if the issue is reproducible then this indicates a bug. Please contact MathWorks Tech Support.

Answer 2

[RaviTeja]

I faced a similar issue, I'm using 2010B SP1.

I was able to run the model,but when I try for code generation(ctrl+B)

This can be happening because of

1. Global Tags: Some times when we use Global Tags, some signals might not be able to travel from source to destination.But, this issue was cleared in later versions of MATLAB.
2. Resolved signals: If you have resolved a signal name, same as source name.
3. Don't leave any white spaces in naming or at anypart of model, It'll also make you to struggle during code generation.