Process finished with exit code -1073741819 (0xC0000005)

I'm trying to build a graph from it's adjacency matrix using igraph package in python.

My matrix(800*800) is a text file. My code is as below, but I don't know why it keeps exiting with code -1073741819 (0xC0000005)

import igraph
adjacencyFile = open("AdjacencyMatrix.txt",'r')
graph = igraph.Graph.Read_Adjacency(adjacencyFile, sep=None, comment_char='#', attribute=None)

The problem was setting the attribute option to None, because I had some weights considerably large in the graph and it couldn't set so many edges for them.