feat(docs): Add troubleshooting section for empty_file error

docs/docs/troubleshooting.md

@@ -74,6 +74,16 @@ Key positions are numbered starting from `0` at the top left key on the keymap,
 A common mistake that leads to this error is to use [key press keycodes](behaviors/key-press.md) without the leading `&kp` binding. That is, having entries such as `SPACE` that should have been `&kp SPACE`.
 :::
 
+#### empty_file.c error
+
+An `empty_file.c` error with `lacks #binding-cells` string indicates possible problems with improper bindings for specific codes:
+
+```
+devicetree error: <Node /soc/gpio@50000300 in '/tmp/tmp.vJq9sMwkcY/zephyr/misc/empty_file.c'> lacks #binding-cells
+```
+
+This error can be triggered by incorrect binding syntax such as `&kp BT_SEL 0` instead of `&bt BT_SEL 0`.
+
 ### Split Keyboard Halves Unable to Pair
 
 Split keyboard halves will automatically pair with one another, but there are some cases where this breaks, and the pairing needs to be reset, for example: