Raspberry Pi Pico and SD Card module

Hi there,

I've been trying really hard to sort out this error with wiring and looking at other forums but just cannot work it out.

This is the error message I get when using sdcard.py:
Traceback (most recent call last):
File "", line 19, in
File "sdcard.py", line 231, in readblocks
OSError: [Errno 5] EIO

And this is the code I am calling it from:
import machine
import sdcard, uos
import time

cs = machine.Pin(13, machine.Pin.OUT)

Intialize SPI peripheral (start with 1 MHz)

spi = machine.SPI(1,
baudrate=1000000,
polarity=0,
phase=0,
bits=8,
firstbit=machine.SPI.MSB,
sck=machine.Pin(14),
mosi=machine.Pin(15),
miso=machine.Pin(12))
sd = sdcard.SDCard(spi, cs)
time.sleep_ms(500)
vfs = uos.VfsFat(sd)
uos.mount(vfs, "/sd")
#uos.mount(sd, '/sd')
time.sleep_ms(500)
print(uos.listdir('/sd'))

If anyone could help that would be appreciated!

Start with the supplied SPI setup and sdcard.py, especially readblocks at line 231, then reproduce the EIO error using the provided Raspberry Pi Pico code. Done means identifying the wiring or initialization cause and confirming that mounting and listing /sd work without the error.