Too many simultaneous downloads?

Somehow, though i am not downloading anything, i get the following message each time i attempt to download a new file:
553 You have reached your maximum simultaneous downloads allowed.
What does this mean? How can i fix it?

are you downloading via the queue (either session or global queue) or via direct download? direct download should work, but for queued downloads a second (or even more) connection(s) are established so you can download and continue browsing the ftp server at the same time. as the server you're using only seem to allow one connection at a time, this might lead to the error message you get.

I download using direct download. I still dont know how exactly global que works, because when i attempt to start the download i always get "waiting for reply". By the way, I only get this message on one server- the other ones i use work fine.