As soon as I open a server the screen will just crash back to my start up for minecraft.

Please attach the crash report.

how

Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 6/22/16 9:55 AM
Description: Server forgot to send required information to construct BlockEntity

java.lang.RuntimeException: Missing BlockEntity
at bqy.b(SourceFile:162)
at bqu.a(SourceFile:100)
at bqt.b(SourceFile:140)
at boh.a(SourceFile:913)
at bnz.a(SourceFile:1237)
at bnz.b(SourceFile:1171)
at bnz.a(SourceFile:1018)
at bcx.av(SourceFile:991)
at bcx.a(SourceFile:396)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Thread: Client thread
Stacktrace:
at bqy.b(SourceFile:162)

– BlockEntity missing instance data –
Details:
BlockState: minecraft:hopper[enabled=true,facing=east]
Block coordinates: World: (-25777,55,-11086), Chunk: (at 15,3,2 in -1612,-693; contains blocks -25792,0,-11088 to -25777,255,-11073), Region: (-51,-22; contains chunks -1632,-704 to -1601,-673, blocks -26112,0,-11264 to -25601,255,-10753)
Stacktrace:
at bqy.b(SourceFile:162)
at bqu.a(SourceFile:100)
at bqt.b(SourceFile:140)
at boh.a(SourceFile:913)
at bnz.a(SourceFile:1237)
at bnz.b(SourceFile:1171)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bnn['DrewSt'/7911, l='MpServer', x=-25796.59, y=55.00, z=-11084.01]]
Chunk stats: MultiplayerChunkCache: 171, 171
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-25793,55,-11086), Chunk: (at 15,3,2 in -1613,-693; contains blocks -25808,0,-11088 to -25793,255,-11073), Region: (-51,-22; contains chunks -1632,-704 to -1601,-673, blocks -26112,0,-11264 to -25601,255,-10753)
Level time: 58103296 game time, 58109281 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 2 total; [bnn['DrewSt'/7911, l='MpServer', x=-25796.59, y=55.00, z=-11084.01], yk['item.tile.cactus'/67848608, l='MpServer', x=-25765.81, y=58.00, z=-11073.40]]
Retry entities: 0 total; []
Server brand: Waterfall (git:Waterfall-Bootstrap:1.9-SNAPSHOT:562ddcf:unknown) <- PaperSpigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bln.a(SourceFile:364)
at bcx.b(SourceFile:2535)
at bcx.a(SourceFile:405)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.10.1
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 114012432 bytes (108 MB) / 249847808 bytes (238 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.10.1
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4600 GL version 4.3.0 - Build 20.19.15.4312, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Can u fix this now how long will It be

FVbico can u answer me back

to be quite frank, i was notified by a moderator about this.

Sorry, but I was bussy IRL.

Being a school bus is responsible work!

Busy*

xD