mpc insert Radiostation fails

[vikozo]

hello
with 
mpc ls you discover the structure of mpc 
with
mpc insert SDCARD/testmusic/testfile.flac
this command will add and play this song just next to the running song, all packet into a bash script and calling up with cron, works fine.

for a favorit Radio Broadcast ones a week i have done the same with but fails

with mpc ls RADIO
my station wanted is there RADIO/KanalK.pls (and no problem calling up with GUI)

but calling up with 
mpc insert RADIO/KanalK.pls 

error adding RADIO/KanalK.pls: No such directory

so what is going wrong?

have a nice day
vinc