Can someone help me understand what this crash rep

Here is the last of the SW performance log:

<EXCEPTION> "Access Violation at 0000001c (virtual address 0000001c), attempt to read from memory";

<STACK> sldworks:Unknown,SLDMODU:moConcept_c::~moConcept_c,SLDMODU:moFeature_c::~moFeature_c,SLDMODU:moModelFeature_c::~moModelFeature_c,SLDMODU:moMateInPlace::createMateOf3OrthogonalPlanes,SLDMODU:moMateInPlace::createMateOf3OrthogonalPlanes,SLDMODU:moNode_c::destroy,SLDMODU:moConcept_c::~moConcept_c,SLDMODU:moFeature_c::~moFeature_c,SLDMODU:moModelFeature_c::~moModelFeature_c,SLDMODU:moMateGroup_c::~moMateGroup_c,SLDMODU:moMateGroup_c::~moMateGroup_c,SLDMODU:moNode_c::destroy,SLDMODU:moConfigurationMgr_c::removeDimValueOnAll,SLDMODU:moConfigurationMgr_c::~moConfigurationMgr_c,SLDMODU:moModel_c::createConfigurationMgr,slduiu:uiModelDoc_c::iDestroyModels;

<EXCEPTION> "Invalid Deactivation";

<MEMORY> 3063667, 1100763136, 1095122944, 1630900, 1408380, 114892, 108772, 1053847552, 1062924288

<FT>1314982638

More importantly, whay can I do to fix this?