Non alligned pointer being freed

The following code generates error: non alligned pointer being freed.
What can I do to fix it?

Code:

Experto::~Experto(){
	for(int i = 0; i < 7; ++i){
		delete this->tableroIndices[i];
		this->tableroIndices[i] = 0;
	}
	delete this->tableroIndices;	
	delete this->listaEstados;
	delete this->solucion;
	this->tableroIndices = 0;
	listaEstados = 0;
	solucion = 0;
}

Here's the tableroIndice's declaration and creation process....

Code:

char ** tableroIndices;

Code:

void Experto::inicializarTableroIndices(){
	this->tableroIndices = new char * [7];
	char indiceTablero = '0';
	for(int i = 0; i < 7; ++i){
		tableroIndices[i] = new char[7];
		for(int j = 0; j < 7; ++j){
			if((i < 2 || i > 4) && (j < 2 || j > 4)){
				this->tableroIndices[i][j] = '_';
			}else{
				this->tableroIndices[i][j] = indiceTablero;
				indiceTablero += 1;
				if(indiceTablero == ':'){
					indiceTablero += 7;
				}
			}
		}
	}
}

Thanks for helping!

Could you please tell us the line number? In the future, please put C++ code in the other forum.

Moved

And how do you initialise these?
delete this->listaEstados;
delete this->solucion;