Access violation reading location in my c program

I am trying to write a C program which takes the values from an array, converts them to certain characters, then prints said characters.

Here is my code:

#include <stdio.h>
#include <errno.h>

int main()
{
    /*
    * for 1 value in matrix, print #
    * for 0 value in matrix, don't print
    * every 3 print statenents start new line
    */

    #define rows 3
    #define cols 3

    int border[rows][cols] = {
        {1, 1, 1},
        {1, 0, 1},
        {1, 1, 1}
    };

    // Print the matrix
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            if (border[i][j] == 0) {
                printf('# ');
            }
            else if (border[i][j] == 1) {
                printf(' ');
            }
            else {
                perror("Error: No corresponding ASCII character for given value in matrix");
            }
        }
        printf("\n");
    }

    return 0;
}

When I run it, I get this error message (coming from the stdio.h file):

Exception thrown at 0x00007FFF18B04431 (ucrtbased.dll) in ASCII Wall Rendering.exe: 0xC0000005: Access violation reading location 0x0000000000000020. 

Don’t really know what exactly to do to try to fix it. (I’m new to C btw, coming from C++)

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