MATLAB giving incomprehensible error codes while generating a protected model..?

Hi there. I have faced an untraceable problem during the protected model generation procedure. Is it possible to get some hints or reach to the source of the problem with error messages displayed by MATLAB while trying to generate a protected model?

Error: File: C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc Line: 1280 Column: 33
Undefined identifier Value
Main program:
==> [00] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnCGIRParamCGVarHelper(1280)
    [01] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibCGIR_PVAddr(1338)
    [02] C:\***\slprj\sim\***\tmwinternal\tlc\s5_b0_pxv1n_0_Outputs.tlc:Outputs(201)
    [03] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenRateGroupedCodeFromModule(3464)
    [04] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenerateCodeFromModule(3378)
    [05] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcn(104)
    [06] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodyFcnCache(139)
    [07] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcnEntry(236)
    [08] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:FcnGenBodySysCache(1011)
    [09] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:SLibGenBodyCache(4162)
    [10] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\formatwide.tlc:<NONE>(55)

Error: File: C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc Line: 1280 Column: 32
Function values are not allowed
Main program:
==> [00] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnCGIRParamCGVarHelper(1280)
    [01] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibCGIR_PVAddr(1338)
    [02] C:\***\tmwinternal\tlc\s5_b0_pxv1n_0_Outputs.tlc:Outputs(201)
    [03] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenRateGroupedCodeFromModule(3464)
    [04] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenerateCodeFromModule(3378)
    [05] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcn(104)
    [06] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodyFcnCache(139)
    [07] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcnEntry(236)
    [08] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:FcnGenBodySysCache(1011)
    [09] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:SLibGenBodyCache(4162)
    [10] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\formatwide.tlc:<NONE>(55)

Error: File: C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc Line: 1281 Column: 29
Undefined identifier value
Main program:
==> [00] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnCGIRParamCGVarHelper(1281)
    [01] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibCGIR_PVAddr(1338)
    [02] C:\***\slprj\sim\***\tmwinternal\tlc\s5_b0_pxv1n_0_Outputs.tlc:Outputs(201)
    [03] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenRateGroupedCodeFromModule(3464)
    [04] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenerateCodeFromModule(3378)
    [05] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcn(104)
    [06] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodyFcnCache(139)
    [07] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcnEntry(236)
    [08] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:FcnGenBodySysCache(1011)
    [09] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:SLibGenBodyCache(4162)
    [10] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\formatwide.tlc:<NONE>(55)

Error: File: C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc Line: 1286 Column: 26
Undefined identifier value
Main program:
==> [00] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnCGIRParamCGVarHelper(1286)
    [01] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibCGIR_PVAddr(1338)
    [02] C:\***\slprj\sim\dynamics_GA\tmwinternal\tlc\s5_b0_pxv1n_0_Outputs.tlc:Outputs(201)
    [03] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenRateGroupedCodeFromModule(3464)
    [04] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:FcnGenerateCodeFromModule(3378)
    [05] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcn(104)
    [06] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodyFcnCache(139)
    [07] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\opaquelib.tlc:SLibFcnGenBodySysFcnEntry(236)
    [08] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:FcnGenBodySysCache(1011)
    [09] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\commonbodlib.tlc:SLibGenBodyCache(4162)
    [10] C:\Program Files\MATLAB\R2012a\rtw\c\tlc\mw\formatwide.tlc:<NONE>(55)

### Build procedure for model: '*******' aborted due to an error.