This is not Multicraft support.

And no crash happened.

i don't see the problem. please try without 30 silly resourcepacks; then later - after things start working, put a few of them back.

Here's my log without mods in the mod folder    

it keeps stating that the jar file "custom.jar" cannot be found, when it is clearly in the server directory. ----- [25.10 11:37:48] [Multicraft] Received start command [25.10 11:37:48] [Multicraft] Loading server properties [25.10 11:37:48] [Multicraft] Starting server! [25.10 11:37:48] [Multicraft] Loaded config for "Special: custom.jar" [25.10 11:37:48] [Multicraft] JAR file not found, copying from global JAR directory [25.10 11:37:48] [Multicraft] Failed to copy jarfile from global JAR directory [25.10 11:37:48] [Multicraft] JAR file not found. Go to "Settings"-"Update Minecraft" to download the JAR file. [25.10 11:37:48] [Multicraft] Updating eula.txt file [25.10 11:37:48] [Server] ErrorUnable to access jarfile /custom.jar [25.10 11:37:48] [Multicraft] Server shut down (starting)  [25.10 11:37:48] [Multicraft] Restarting crashed server in 2.0 seconds [25.10 11:37:48] [Multicraft] Looks like a crash, check the server console. Return value: 1