at+QAUDPLAY return error code 4499

With the Quectel M60E, i try to upload a binary file to the RAM, and let the Modem play it

at+qfupl=“RAM:a.wav”,144428
at+qflst=“RAM:a.wav”
+QFLST: “RAM:a.wav”,144428,144428
at+QAUDPLAY=“RAM:a.wav”,0,100,2
+CME ERROR: 4499

But when i play the file, it return me the error code fo 4499.

May i know what is 4499 means?