Why does my model throw a Physical Modeling assertion when using SimMechanics 2.5 (R2006b)?

My model crashes in R2006b with the following crash dump:

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              Assertion detected at Tue Oct 03 16:27:44 2006

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 Assertion failed Forced Assertion:  at line 304 of file ".\compiler.cpp".

 Physical Modeling Assertion

 Stack Trace:

   [0] bridge.dll:_mnSignalHandler(0xffffffff, 0, 0, 0x79e5a2b5) + 355 bytes

   [1] bridge.dll:void __cdecl ThrowAssertion(void)(0x00d1a84c "p¨Ñ", 0x00d1a208, 0x65737341, 0x6f697472) + 131 bytes

   [2] bridge.dll:void __cdecl MATLABAssertFcn(char const *,char const *,int,char const *)(0x0f50c8b8 " Forced Assertion: ", 0x0f50c8cc ".\compiler.cpp", 304, 0x0f50c8dc "Physical Modeling Assertion") + 110 bytes

   [3] mechanical.mexw32:0x0f49ecd7(0x13263140, 0, 0x7a4b659b, 0x0ef89fb0 "__ehhandler$??$_Uninit_copy@PAV?..")

   [4] mechanical.mexw32:0x0f4dd8f4(0x13263140, 0x00d1a894 "À¨Ñ", 0x7a473457, 0x13263140)

   <SNIP>

Answer 1

[MathWorks Support Team]

This bug has been fixed in Release 2007a (R2007a). For previous product releases, read below for any possible workarounds:

The model crashes because some Body blocks have unsupported Body coordinate system (CS) names (e.g., elbow/INJ). Only names provided by the dialog are supported, i.e., CS#, where # is a nonnegative integer. It is possible that you have manually edited the block parameters to unsupported body CS names (INJ, SENS, etc...).

As a workaround in SimMechanics 2.5 (R2006b), rename all the Body CS's using the block dialog.