My server worked for the longest time yet, roughly 3 months... Then last week it started giving me this warning: "Failed to mark a promise as success because it is done already." I didn't even know that a program could make a promise, let alone mark it as successful and not know it! It would also lag around every three seconds, which coincided with when the error was announced in the log.
A screenshot is included for your convenience.
Does anyone have any suggestions? It is running Pixelmon 4.0.5.
No luck. I upgraded to Forge 1398 and it's still doing it's promise thing.
Well, it's either upgrade Netty, or wait for Mojang to fix it, because they caused it. Apparently one of the other solutions is to use the installer for Pixelmon, rather than swapping the universal JARs in and out, so you could try that, but if that doesn't work, you're outta luck.