Every now and then, I remove pictures from older comments I've made, especially when they exceed 50 kB.
We all start out with a 4 MB attachment limit. The limit gets smaller each time we upload a picture to our comments. So, that 2.379 kB is telling me that you've used about 99.96% of your original attachment limit.
The only way to increase the limit again is by deleting older attachments/images.
1. In the upper right corner of your screen, click on your username.
2. You'll see a drop down menu. The first section you should see in that menu is 'Content'. Under that section, click on 'My Attachments'.
3. You'll then see a list of all the attachments you have in GA. On each row, you'll see the attachment itself, a link to where you used it, and a box. Clicking on the box will select that attachment, and you'll see an option to delete it. So select any or all attachments and delete them.
That should free up space, and your attachment limit will go back up.