It sounds like your printer has reached what is often called the "service required" stage...
To solve this you need to handle two things.
1. Get the printer protection counter (or waste-ink as it's sometimes called) reset.
2. Replace the waste ink pads OR redirect your waste ink flow to an external tank
It's important to note that Epson will encourage you to do a waste pad replacement through one of their service centers, but if you're out of warranty this will cost a significant amount of money (approx: $100 - 200)
To solve these as a DIY you can do the following:1. Resetting the counter...
Get a resetter, either the SSC utility (google: epson SSC utility) or the IPR utility that Epson have now made available via their website here
The latter is only available to North American printer owners so the SSC is a safer bet.2. Redirecting waste ink to an external container.
This is something I'd heartily recommend instead of trying to change the waste pads yourself... It's simple enough to do and a little googling using keywords "Epson R2400 waste ink tank" should get you all the info you need.
There are simple kits available that offer everything you need or you can easily go for a DIY with bits you have to hand.
Hope that helps...