no new WU from SETI,ROSETTA,EINSTEIN

I run SETI, ROSETTA,EINSTEIN and I have processed several WU of SETI and ROSETTA and only one of EINSTEIN. But from some days I can't fetch new work from the projects ( the first was Einstein) and I receive this messages from server: not requesting new work and today "you don't have enough.... no disk space( you must free 243,9 MB ).But I've not change anything in my computer or in general preferences.
Help !
Thank you
Diego from Italy