I need help for mcp

I need help with mcp

Here are the logs:
I am trying to code minecraft having some fun but when i decomplie the file its says !! Missing server jar file. Aborting !! then
Initial client recompile failed, correct source then run updatemd5 and after that 5 errors

The whole log:
== MCP 9.40 (data: 9.40, client: 1.12, server: 1.12) ==

1. found ff, ff patches, srgs, name csvs, doc csvs, param csvs, astyle, astyle config, scalac, rg, ss
   == Decompiling client using fernflower ==
   > Creating SRGs
   > Applying SpecialSource
   > Applying MCInjector
   > Creating renamed srg
   > Filtering classes
   > Decompiling
   > Unpacking jar
   > Copying sources
   > Generating package-info files
   > Applying fernflower fixes
   > Applying patches
   > Cleaning comments

• Done in 161.59 seconds
  == Reformating client ==
  > Cleaning sources
  > Replacing OpenGL constants
  > Reformating sources
• Done in 27.97 seconds
  == Updating client ==
  > Adding javadoc
  > Renaming sources
• Done in 40.63 seconds
  !! Missing server jar file. Aborting !!
  == Recompiling client ==
  > Cleaning bin
  > Recompiling
  '"scalac.bat" -encoding UTF-8 -deprecation -target:jvm-1.8 -classpath "jars\versions\1.12\1.12.jar;lib;lib*;jars\libraries\com\google\code\findbugs\jsr305\3.0.1\jsr305-3.0.1.jar;jars\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;jars\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;jars\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;jars\libraries\org\apache\logging\log4j\log4j-api\2.8.1\log4j-api-2.8.1.jar;jars\libraries\org\apache\commons\commons-lang3\3.5\commons-lang3-3.5.jar;jars\libraries\net\java\dev\jna\jna\4.4.0\jna-4.4.0.jar;jars\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar;jars\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;jars\libraries\net\sf\jopt-simple\jopt-simple\5.0.3\jopt-simple-5.0.3.jar;jars\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3.jar;jars\libraries\com\google\guava\guava\21.0\guava-21.0.jar;jars\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar;jars\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;jars\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;jars\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3-natives-windows.jar;jars\libraries\it\unimi\dsi\fastutil\7.1.0\fastutil-7.1.0.jar;jars\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar;jars\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;jars\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;jars\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;jars\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar;jars\libraries\commons-codec\commons-codec\1.10\commons-codec-1.10.jar;jars\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;jars\libraries\com\mojang\patchy\1.3.9\patchy-1.3.9.jar;jars\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;jars\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar;jars\libraries\commons-io\commons-io\2.5\commons-io-2.5.jar;jars\libraries\com\mojang\realms\1.10.17\realms-1.10.17.jar;jars\libraries\com\mojang\authlib\1.5.25\authlib-1.5.25.jar;jars\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar;jars\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar;jars\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;jars\libraries\org\apache\logging\log4j\log4j-core\2.8.1\log4j-core-2.8.1.jar;jars\libraries\io\netty\netty-all\4.1.9.Final\netty-all-4.1.9.Final.jar" -sourcepath src\minecraft -d bin\minecraft @temp\java_src_client.txt @temp\scala_src_client.txt' failed : 1

== ERRORS FOUND in SCALA CODE ==

bad option '-target:jvm-1.8' was ignored
←[31m←[31m-- [E057] Type Mismatch Error: src\minecraft\net\minecraft\block\BlockFlower.java:68:33 ←[0m←[0m
←[31m68 |←[0m public IProperty<BlockFlower.EnumFlowerType> getTypeProperty()
←[31m←[31m |←[0m ^←[0m

←[31m |←[0mType argument net.minecraft.block.BlockFlower.EnumFlowerType does not conform to upper bound Comparable[net.minecraft.block.BlockFlower.EnumFlowerType]
←[31m |←[0m
←[31m |←[0m longer explanation available when compiling with `-explain`
←[31m←[31m-- [E057] Type Mismatch Error: src\minecraft\net\minecraft\block\BlockRail.java:30:35 ←[0m←[0m
←[31m30 |←[0m public IProperty<BlockRailBase.EnumRailDirection> getShapeProperty()
←[31m←[31m |←[0m ^←[0m

←[31m |←[0mType argument net.minecraft.block.BlockRailBase.EnumRailDirection does not conform to upper bound Comparable[net.minecraft.block.BlockRailBase.EnumRailDirection]
←[31m |←[0m
←[31m |←[0m longer explanation available when compiling with `-explain`
←[31m←[31m-- [E057] Type Mismatch Error: src\minecraft\net\minecraft\block\BlockRailBase.java:180:44 ←[0m←[0m
←[31m180 |←[0m public ←[33mabstract←[0m IProperty<BlockRailBase.EnumRailDirection> getShapeProperty();
←[31m←[31m |←[0m ^←[0m

←[31m |←[0mType argument net.minecraft.block.BlockRailBase.EnumRailDirection does not conform to upper bound Comparable[net.minecraft.block.BlockRailBase.EnumRailDirection]
←[31m |←[0m
←[31m |←[0m longer explanation available when compiling with `-explain`
←[31m←[31m-- [E057] Type Mismatch Error: src\minecraft\net\minecraft\block\BlockRailDetector.java:167:35 ←[0m←[0m
←[31m167 |←[0m public IProperty<BlockRailBase.EnumRailDirection> getShapeProperty()
←[31m←[31m |←[0m ^←[0m

←[31m |←[0mType argument net.minecraft.block.BlockRailBase.EnumRailDirection does not conform to upper bound Comparable[net.minecraft.block.BlockRailBase.EnumRailDirection]
←[31m |←[0m
←[31m |←[0m longer explanation available when compiling with `-explain`
←[31m←[31m-- [E057] Type Mismatch Error: src\minecraft\net\minecraft\block\BlockRailPowered.java:198:35 ←[0m←[0m
←[31m198 |←[0m public IProperty<BlockRailBase.EnumRailDirection> getShapeProperty()
←[31m←[31m |←[0m ^←[0m

←[31m |←[0mType argument net.minecraft.block.BlockRailBase.EnumRailDirection does not conform to upper bound Comparable[net.minecraft.block.BlockRailBase.EnumRailDirection]
←[31m |←[0m
←[31m |←[0m longer explanation available when compiling with `-explain`
1 warning found
5 errors found
================================

Initial client recompile failed, correct source then run updatemd5
Press any key to continue . . .

If someone know please help me