I recently bought 5 refillable cartridges (2 black, 3 color) for my Epson C120 printer from www.echostore.com. After filling the cartridges, I put the 5 cartridges into my printer and tried to print a test page. It didn't work, and instead I got an error message showing that all of the cartridges were empty. I then tried putting the original cartridges back into the printer, and it told me that the cartridges were not compatible with the printer and needed to be replaced. Obviously they are compatible though since they came with the printer and I printed multiple times with them beforehand. What do I have to do to fix this problem? Please help!