[17:12:55 WARN]: Mod McMultipart is missing the required element 'version' and a version.properties file could not be found. Falling back to metadata version 1.1.2.331
[17:12:55 ERROR]: Found a duplicate mod Thaumcraft at [D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5.jar, D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5-SaraFix-a1.jar]
[17:12:55 ERROR]: Encountered an unexpected exception
cpw.mods.fml.common.DuplicateModsFoundException:
Duplicate Mods:
Thaumcraft : D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5.jar
Thaumcraft : D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5-SaraFix-a1.jar


at cpw.mods.fml.common.Loader.identifyDuplicates(Loader.java:403) ~[Loader.class:1.7.10-R0.1-SNAPSHOT]
at cpw.mods.fml.common.Loader.identifyMods(Loader.java:365) ~[Loader.class:1.7.10-R0.1-SNAPSHOT]
at cpw.mods.fml.common.Loader.loadMods(Loader.java:489) ~[Loader.class:1.7.10-R0.1-SNAPSHOT]
at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87) ~[FMLServerHandler.class:1.7.10-R0.1-SNAPSHOT]
at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:320) ~[FMLCommonHandler.class:1.7.10-R0.1-SNAPSHOT]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:176) ~[lt.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:631) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
[17:12:55 ERROR]: This crash report has been saved to: D:\sers\.\crash-reports\crash-2020-02-09_17.12.55-server.txt
[17:12:55 WARN]: Can't revert to frozen GameData state without freezing first.
[17:12:55 INFO]: Applying holder lookups
[17:12:55 INFO]: Holder lookups applied
[17:12:55 INFO]: The state engine was in incorrect state CONSTRUCTING and forced into state SERVER_STOPPED. Errors may have been discarded.
[MCSMANAGER]

你没发现你没把非修复版的给删除吗?

Thaumcraft : D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5.jar
Thaumcraft : D:\sers\mods\M-Thaumcraft-1.7.10-file:///4.2.3.5-SaraFix-a1.jar

试试把内存调小