Compiling X_Nucleo_IKS01A1 Library - Incorrect "no such file or directory error"

When trying to compile the X_Nucleo_IKS01A1 MEMS sensor library (found here), I get the error shown in the screenshot below.

The files in question are both in the same folder. I’m wondering if they’re not being loaded / detected properly?

Compiling the Mbed and Mbed-rtos libraries under the same project works fine.

I’m using version 1.6.0 of the IDE and 3.1.0 of the CLI.