Problem Server crashes soon after running start.bat

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Looks like the installation of the server failed, look in the mods folder if there's mods that are 0bytes in size.

If yes, put the server installer in a new folder and re-install the server.

If you still have mods that are 0 bytes

If you have a 3rd party Antivirus software installed:
Verify that your Antivirus software is not blocking - this only needs to be sorted out for 3rd party ones, the built in one have not had these issues - disable will not do it, it needs exclude/whitelist or what ever it's called in the specific software.

If you still have issues, post new log (.../logs/latest.log) and share it using https://paste.feed-the-beast.com and give the link here.