Run out of disk space?
Check if there is some reserved. \\
Check how much reserved there is (replace the /dev/xvda1 with your filesystem):
<sxh bash>
tune2fs -l /dev/xvda1 | grep 'Reserved block count'
</sxh>
\\
The following command will free up some space:
<sxh bash>
tune2fs -m 1 /dev/xvda1
</sxh>