[Server thread/WARN]: Invalid entity class name (class not found): 'appeng.entity.SingularityEntity'
[Server thread/WARN]: Invalid explosion class name (class not found): 'slimeknights.tconstruct.gadgets.entity.ExplosionEFLN'

They are logged several times.

If think they are relatedto this mod because of this two links:

• source code of this mod
• this comment

Sure. I don't mind warnings if they just don't break anything.
Since it's a new server I'm building I was just looking at the logs and letting the creators know just in case.

Thanks for the mod and the reply. Just do as you please if you ever change this behavior :)

They are just warnings about the explosion classes not being found, if you don't have AE2 and TiC installed. There be around 4 different possible fixes for this:

• Don't print the warnings at all. But this would be annoying for anyone who is trying to configure them, if they don't get any feedback at all.
• Put them behind the verbose logging option (or add a new config option that enables the warnings).
• Don't add those default config values at all and leave them for the user.
• Log these warnings on the DEBUG level instead of WARN level, and then they wouldn't be visible normally in the log. But this would again be annoying for users trying to configure stuff, if they need to change the log level and get a lot more log spam from other places at the same time.

I think option 2 might be the best option, but thus far I haven't bothered doing anything about it since most people probably don't care about a couple of warnings in the log when so many other mods are spamming all kinds of stuff there anyway.