构造函数中的分段错误

这种情况发生在 每 我试着用C++做的课。从java迁移过来,我发现问题主要是在生成类方面。我运行valgrind,它似乎在构造函数中。

==30214== Memcheck, a memory error detector
==30214== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==30214== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==30214== Command: ./CoC
==30214== 
==30214== 
==30214== Process terminating with default action of signal 11 (SIGSEGV)
==30214==  Bad permissions for mapped region at address 0x404B4F
==30214==    at 0x4C2B9EC: strcat (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==30214==    by 0x404220: Model::Model(std::string) (in /home/kronus/Apollo/CoC)
==30214==    by 0x402617: main (in /home/kronus/Apollo/CoC)

正如您所看到的,我正试图将这个模型类的构造函数调用到主方法中。这是构造函数的代码

Model::Model(std::string filename)
{
m_TotalFaces = 0;
m_model = lib3ds_file_load(filename.c_str());
    // If loading the model failed, we throw an exception
    if(!m_model)
    {
           throw strcat("Unable to load ", filename.c_str());
    }
}

当它被调用时,它会以分段错误结束。重要提示:我已经在头文件中声明了类。这就是我得到错误的时候。我把这个类放在源文件中,它运行得很好。我做错了什么?