C++ CRT detected VS:community

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error-handling

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Hello there. I got my class Error. For some reason VS:Community 2017 gives me an error.

HEAP CORRUPTION DETECTED: after Normal block (#149) at 0x00000282A99E0DE0.
CRT detected that the application wrote to memory after end of heap buffer

I've tried to change my code as much as I could and I can't see what's causing the problem.

Here's my code.
Error.h

// compilation safegaurds
#ifndef ICT_ERROR_H_
#define	ICT_ERROR_H_

#include <iostream>
namespace ict {
   class Error {
      char* m_message;
   public:
   // constructors
	   //Sets the m_message member variable to nullptr.
	   Error();
	   //Sets the m_message member variable to nullptr and then uses the message() setter member function to set the error message to the errorMessage argument.
	   Error(const char* errorMessage);
	   //A deleted copy constructor to prevent an Error object to be copied.
	   Error(const Error& em) = delete; //no implementation needed
   // destructor

   // deleted constructor and operator=
	   //A deleted assignment operator overload to prevent an Error object to be assigned to another.
	   Error& operator=(const Error& em) = delete;//no implementation needed
   // operator= for c-style strings
	   void operator=(const char* errorMessage);
   // methods
	   virtual ~Error(){ delete [] m_message; m_message = nullptr;};
	   void clear();
	   bool isClear()const;
	   void message(const char* value);
	   operator const char*() const;
	   operator bool()const;
   // cast overloads
	   friend std::ostream& operator<<(std::ostream& ostr, const Error& em);
   };
   // operator << overload prototype for cout
 
   std::ostream& operator<<(std::ostream& ostr, const Error& em);
}
#endif //ICT_ERROR_H_

Error.cpp

#define _CRT_SECURE_NO_WARNINGS 

#include "Error.h"
#include <iostream>
#include <cstring>

namespace ict{
	Error::Error() {
		m_message = nullptr;
	}

	Error::Error(const char* errorMessage) {
		m_message = nullptr;
		message(errorMessage);
	}

	//have a look
	void Error::operator=(const char* errorMessage) {
		clear();//dealloc m_message
		message(errorMessage);
	}

	void Error::clear() {
		delete[] m_message;
		m_message = nullptr;

	}


	bool Error::isClear()const {
		bool clear = false;
		if (m_message == nullptr) {
			clear = true;
		}
		return clear;
	}

	void Error::message(const char* value) {
		//clear();//dealloc m_message
		delete[] m_message;
		m_message = new char[strlen(value + 1)];
		strcpy(m_message, value);
	}

	Error::operator const char*() const {
		return m_message;
	}

	Error::operator bool()const {
		return isClear();
	}

	std::ostream& operator<<(std::ostream& ostr, const Error& em) {
		if (em.isClear()) {
			//nothing
		}
		else {
			ostr << em.m_message;
		}

		return ostr;
	}

}//namespace ict

Main.cpp

#include <iostream>
#include "Error.h"
using namespace std;
using namespace ict;
int main(){
  Error T("Testing Error Message");
  Error e;
  bool ok = true;
  int pc = 1;
  cout << T << endl << e << endl << "isClear(): " << (e.isClear() ? "Passed!" : "failed!") << endl;
  if (!e.isClear()) ok = false;
  for (int i = 0; i < 10000000; i++){
    e = "Some error message that is really long long  long  long  long  long  long  long"
       " long  long  long  long  long  long  long  long  long  long  long  long  long"
       " long  long  long  long  long  long  long  long  long  long  long  long  long"
       " long  long  long  long  long  long  long  long  long  long  long  long  long"
       " long  long  long  long  long  long  long  long  long  long  long  long  long"
       " long  long  long  long  long  long  long  long  long  long  long  long  long"
       ;
    if (i % 100000 == 0) cout << "\r" << pc++ << "%";
  }
  cout << endl << e << endl << "isClear(): " << (e ? "Failed!" : "Passed!") << endl;
  if (e) ok = false;
  e.message("Short Error Message");
  cout << e << " is the same as " << (const char*)e << endl << "isClear(): " << (e.isClear() ? "Failed!" : "Passed!") << endl;
  e.clear();
  cout << "Nothing here: >" << e << "<" << endl << "isClear(): " << (e.isClear() ? "Passed!" : "Failed!") << endl;
  if (!e) ok = false;
  cout << (ok ? "All tests passed!" : "Failed!") << endl;
  return 0;
}

What I have tried:

I've tried to compile the same code in Linux terminal with g++ and it works there as expected! So, I assume I got a memory leak some where. Could someone please point me where to look?

Linux terminal output:

Testing Error Message

isClear(): Passed!
100%
Some error message that is really long long  long  long  long  long  long  long long  long  long  long  long  long  long  long  long  long  long  long  long long  long  long  long  long  long  long  long  long  long  long  long  long long  long  long  long  long  long  long  long  long  long  long  long  long long  long  long  long  long  long  long  long  long  long  long  long  long long  long  long  long  long  long  long  long  long  long  long  long  long
isClear(): Passed!
Short Error Message is the same as Short Error Message
isClear(): Passed!
Nothing here: ><
isClear(): Passed!
All tests passed!