Sorry to bother you.

I've recently tried to run the apple2e driver from the terminal and got this "error"

Driver apple2e (file apple2.cpp): 7 errors, 0 warnings
Errors:
Street Electronics Echo Plus device 'sl1:echoiiplus': Required device ':sl1:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl2:echoiiplus': Required device ':sl2:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl3:echoiiplus': Required device ':sl3:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl4:echoiiplus': Required device ':sl4:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl5:echoiiplus': Required device ':sl5:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl6:echoiiplus': Required device ':sl6:echoiiplus:mockbd_ay2' not found
Street Electronics Echo Plus device 'sl7:echoiiplus': Required device ':sl7:echoiiplus:mockbd_ay2' not found

Required device ':sl1:echoiiplus:mockbd_ay2' not found
Ignoring MAME exception: Missing some required objects, unable to proceed
Fatal error: Missing some required objects, unable to proceed

any idea why?