JobDestroyer

Experiencing what I believe is the same error. 

[23:35:12] [Server thread/INFO]: StarFscker joined the game
[23:35:13] [Server thread/WARN]: Failed to handle packet for /172.16.2.2:44730
q: Ticking player
       at yi.i(SourceFile:475) ~[server.jar:?]
       at yz.b(SourceFile:198) ~[server.jar:?]
       at lv.a(SourceFile:234) ~[server.jar:?]
       at yy.c(SourceFile:171) [server.jar:?]
       at net.minecraft.server.MinecraftServer.b(SourceFile:872) [server.jar:?]
       at xh.b(SourceFile:345) [server.jar:?]
       at net.minecraft.server.MinecraftServer.a(SourceFile:799) [server.jar:?]
       at net.minecraft.server.MinecraftServer.run(SourceFile:658) [server.jar:?]
       at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.IllegalArgumentException: Cannot get property cdt{name=axis, clazz=class fr$a, values=[x, y, z]} as it does not exist in Block{minecraft:spruce_wall_sign}
       at cct.c(SourceFile:93) ~[server.jar:?]
       at btc.a(SourceFile:58) ~[server.jar:?]
       at ccu$a.d(SourceFile:691) ~[server.jar:?]
       at bib.a(SourceFile:171) ~[server.jar:?]
       at bib.a(SourceFile:364) ~[server.jar:?]
       at bhw.a(SourceFile:452) ~[server.jar:?]
       at bbp.j(SourceFile:290) ~[server.jar:?]
       at bbq.l(SourceFile:575) ~[server.jar:?]
       at amy.h(SourceFile:2175) ~[server.jar:?]
       at bbq.h(SourceFile:274) ~[server.jar:?]
       at yi.i(SourceFile:411) ~[server.jar:?]
       ... 8 more
[23:35:13] [Server thread/INFO]: StarFscker lost connection: Internal server error
[23:35:13] [Server thread/INFO]: StarFscker left the game
[23:35:17] User Authenticator #3/INFO: UUID of player StarFscker is 9a82b61e-2aec-4b94-ab92-1c0def62d2a4
[23:35:17] [Server thread/INFO]: StarFscker/172.16.2.2:44734 logged in with entity id 953 at (-82.60054377627786, 85.0, -247.186522798741)
[23:35:17] [Server thread/INFO]: StarFscker joined the game
[23:35:18] [Server thread/WARN]: Failed to handle packet for /172.16.2.2:44734
q: Ticking player
       at yi.i(SourceFile:475) ~[server.jar:?]
       at yz.b(SourceFile:198) ~[server.jar:?]
       at lv.a(SourceFile:234) ~[server.jar:?]
       at yy.c(SourceFile:171) [server.jar:?]
       at net.minecraft.server.MinecraftServer.b(SourceFile:872) [server.jar:?]
       at xh.b(SourceFile:345) [server.jar:?]
       at net.minecraft.server.MinecraftServer.a(SourceFile:799) [server.jar:?]
       at net.minecraft.server.MinecraftServer.run(SourceFile:658) [server.jar:?]
       at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.IllegalArgumentException: Cannot get property cdt{name=axis, clazz=class fr$a, values=[x, y, z]} as it does not exist in Block{minecraft:spruce_wall_sign}
       at cct.c(SourceFile:93) ~[server.jar:?]
       at btc.a(SourceFile:58) ~[server.jar:?]
       at ccu$a.d(SourceFile:691) ~[server.jar:?]
       at bib.a(SourceFile:171) ~[server.jar:?]
       at bib.a(SourceFile:364) ~[server.jar:?]
       at bhw.a(SourceFile:452) ~[server.jar:?]
       at bbp.j(SourceFile:290) ~[server.jar:?]
       at bbq.l(SourceFile:575) ~[server.jar:?]
       at amy.h(SourceFile:2175) ~[server.jar:?]
       at bbq.h(SourceFile:274) ~[server.jar:?]
       at yi.i(SourceFile:411) ~[server.jar:?]
       ... 8 more
[23:35:18] [Server thread/INFO]: StarFscker lost connection: Internal server error

Right before this started happening, I removed a map from a spruce item frame, was kicked from the server 3 seconds or so later. Now, every time I join I'm immediately disconnected and this error is showing up in the logs.

On my system, it seems to be due to a spruce_wall_sign, but on OP's it is a dark oak wall sign causing the issue it seems.