I have a server using a external host, I installed 4.2.6 version of pixelmon and everything seemed to be running smoothly. I caught 6 Pokemon to fill my party and then caught another which was sent to my PC. I then tried opening the PC and I was timed out and received the message 'A fatal error has occurred, this connection is terminated'. This now happens everytime I access the PC. I tried finding a solution online but I'm not an expert with servers and solving problems. I wonder if there's any advice you could give me to fix the issue.

4.2.6 is old and 4.2.7 was pushed out to fix numerous issues it had. Update. 4.3 is the best option as 4.2.7 also has bugs and is no longer being supported as well- all bugs in those versions have been patched in 4.3