Compiler Error of Generated code.

error.log

In file included from Vtest__ALL.cpp:6:
Vtest___024unit__DepSet_h9b08f7a8__0.cpp: In function 'std::string VL_TO_STRING(const Vtest_StructType__struct1&)':
Vtest___024unit__DepSet_h9b08f7a8__0.cpp:13:42: error: invalid user-defined conversion from 'const VlWide<8>' to 'int' [-fpermissive]
   13 |     out += "'{msg:" + VL_TO_STRING_W(obj.msg);
      |                                      ~~~~^~~
In file included from /home/yodalee/local/share/verilator/include/verilated.h:930,
                 from Vtest.h:11,
                 from Vtest.cpp:4,
                 from Vtest__ALL.cpp:3:
/home/yodalee/local/share/verilator/include/verilated_types.h:217:5: note: candidate is: 'VlWide<T_Words>::operator WDataInP() const [with long unsigned int T_Words = 8; WDataInP = const unsigned int*]' (near match)
  217 |     operator WDataInP() const VL_PURE { return &m_storage[0]; }  // This also allows []
      |     ^~~~~~~~
/home/yodalee/local/share/verilator/include/verilated_types.h:217:5: note:   no known conversion from 'WDataInP' {aka 'const unsigned int*'} to 'int'
In file included from Vtest__ALL.cpp:6:
Vtest___024unit__DepSet_h9b08f7a8__0.cpp:13:37: error: too few arguments to function 'std::string VL_TO_STRING_W(int, WDataInP)'
   13 |     out += "'{msg:" + VL_TO_STRING_W(obj.msg);
      |                       ~~~~~~~~~~~~~~^~~~~~~~~
In file included from /home/yodalee/local/share/verilator/include/verilated.h:930,
                 from Vtest.h:11,
                 from Vtest.cpp:4,
                 from Vtest__ALL.cpp:3:
/home/yodalee/local/share/verilator/include/verilated_types.h:50:20: note: declared here
   50 | extern std::string VL_TO_STRING_W(int words, const WDataInP obj);
      |                    ^~~~~~~~~~~~~~
In file included from Vtest__ALL.cpp:8:
Vtest___024root__DepSet_hc07518e4__0__Slow.cpp: In function 'void Vtest___024root___ctor_var_reset(Vtest___024root*)':
Vtest___024root__DepSet_hc07518e4__0__Slow.cpp:63:37: error: request for member 'msg' in 'vlSelf->Vtest___024root::in', which is of non-class type 'CData' {aka 'unsigned char'}
   63 |     VL_RAND_RESET_W(256, vlSelf->in.msg);
      |                                     ^~~