Why does this simple file read method does not work?

[babaliaris]

std::string Program::readFile(const char* path)
{

	//Variables.
	std::ifstream file;
	std::string content;

	//Set exception mask for file stream.
	file.exceptions(std::ifstream::failbit | std::ifstream::badbit);


	//Try to read the file.
	try
	{

		//Open the file.
		file.open("test.txt");

		//Read the content.
		file >> content;

		//Close the file.
		file.close();

		//Return the content.
		return content;
	}

	//Something went wrong.
	catch (std::ifstream::failure e)
	{
		std::cout << "[Read Error]: " << path << " => " << e.what() << std::endl;
	}

	return NULL;
}

If I run this method I get this access violation exception (Is being thrown at the file.open() call):

Exception thrown at 0x00007FFD4C42FCB1 (ucrtbased.dll) in LearnOpenGL.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

The exception is in the file xstring at these lines:

#else // _HAS_CXX17
        return _CSTD strlen(reinterpret_cast<const char*>(_First));
#endif // _HAS_CXX17

Tnank you!