Waveshield SD I/O Errors

Trying to connect waveshield to Arduino Uno to use SD card reader. Run the code - it compiles and uploads but we experience:

Wave test! Free RAM: 399 Card init. failed! SD I/O error 1,0.

Does anyone know what this error code is/how to solve it?

Is there another list of error codes? The library in use is WaveHC (https://github.com/adafruit/WaveHC).

We've tested the Arduino Uno separately and confirmed that it works.