hiya guys, im trying to convert 400 M4a files to mp3 to be read on my dj denon prime go mixer. i get this error everytime i try to convert one ..

Error converting to mp3 (Lame), 'C:\Users\Andy\Desktop\m4a\CamelPhat, Yannis - Hypercolour (ARTBAT Remix) [Audio].m4a' to 'C:\Users\Andy\Desktop\m4a\CamelPhat, Yannis - Hypercolour (ARTBAT Remix) [Audio].mp3'
Error opening tag reader. [m4aFile::Open]

ive tried audacity and it needs a plugin, ie tried ojosoft and it doesnt support the m4a files i have. some m4a files will process fine, but others just fail every time

please help