My modded server loads all the mods and it says coremod data can't be found and it also says Missing minecraft:entities:
cfm:mirror and i don't know how to fix it 
My modded server wont start!
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- English
- _Chipi_Munk_
- Closed
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ok, is it showing on your server console?
if yes, you have reinstall your server and make sure to backup the world before you reinstall.Hope this works for you.
Any questions? feel free to ask!
-Gary
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ok, i made a new server with this exact glitch like yours.
Im working on it right now, the solution for now is to make a new server, and use ccleaner to clean cookies and make sure to have your browser up to date.
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i think i got it.
You need to find a mod that contains a support for your first mod! Tell me what mods are you using? than i can show you the right coremod.
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ok, im working on it right now.
Woops, i forgot to tell you, that some mods aren't compatible with forge server.
Fairylights dont work for servers
sometimes, but make sure mods are up to date
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Follow these steps (I'm not mod wizard, so some may be inaccurate)
A. Checking to make sure the mods installed have dependency mods. This can cause issues if dependencies are missing
B. All mods on the server are installed on the client
C
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Can You share server log?
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Roman
Closed the thread.