[Errno 121] Remote I/O error - Scroll pHat HD

I bought the scroll bot kit and am trying to run the following code on it:

import scrollphathd as sphd

sphd.set_pixel(0, 1, 0.5)

but it’s giving me this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py", line 590, in show
  File "/usr/lib/python2.7/dist-packages/scrollphathd/is31fl3731.py", line 627, in _bank
    self.i2c.write_i2c_block_data(self.address, _BANK_ADDRESS, [bank])
IOError: [Errno 121] Remote I/O error

specifically on the sphd.show() line.

Does anyone know what might be the issue? Nothing on the LED board lights up. I used the solderless headers for this project.

i2c enabled?
If you run sudo i2cdetect -y 1 do you see a 0x74?