ls: Unknown option '-L'. Aborting.

[DeaD3R]

On Amazon Fire HD 10 7th gen (2017), I get this in the console:

ls: Unknown option '-L'. Aborting.

ls: Unknown option '-L'. Aborting.

ls: Unknown option '-L'. Aborting.

and no files or folders listed in the left panel:

ADB is connected and PC is authorized.

Fire runs modified Android 5.1. Could this be old OS issue or FireOS issue?

Also I get same line

ls: Unknown option '-L'. Aborting.

whenever I enter or delete any character in the address bar.