Filezilla Problem – uploading .php files

Hello, I need to fix my problem with uploading files using FileZilla. I was uploading .php files to my computer using FileZilla and an error message popped up. It says: Response: 552 Disk Full – please upload later. Error: Critical File Transfer Error. I was confused why it says that the disk is full when my control panel is showing me that my memory usage is 4MB out of 500MB. Please help me with this.
