View Compilation Error

0_0_1120413_25678.cpp: In function `int main()':
0_0_1120413_25678.cpp:36: error: invalid conversion from `char' to `const char*'
0_0_1120413_25678.cpp:36: error:   initializing argument 2 of `std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::insert(typename _Alloc::size_type, const _CharT*) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'