iPod Cannot transfer purchased music to iPod

[mysterui]

I keep getting the error message "Some of the iTunes Store files in the iTunes library cannot be copied to <my iPod> because the Ipod may only contain content from five iTunes store accounts"

Now, the only store account for my iPod is mine, but is that talking about how many computers my iPod content is authorized for?

 

[pianoman]

only by reading the error message you posted, it seems that your iPod contains iTunes Store songs downloaded from five different accounts. apparently, this is not allowed (it's news to me!).