Screenshot of vague error doesn't give us anything. Post the log from that session so we can see what is causing the error. There is a Sticky thread you were supposed to read....
voila
Initialize engine version: 2018.2.0f2 (787658998520)
Forcing GfxDevice: Direct3D 11
GfxDevice: creating device client; threaded=1
Direct3D:
Version: Direct3D 11.0 [level 11.0]
Renderer: NVIDIA GeForce GTX 1060 6GB (ID=0x1c03)
Vendor:
VRAM: 6030 MB
Driver: 22.21.13.8476
Begin MonoManager ReloadAssembly
- Completed reload, in 0.080 seconds
<RI> Initializing input.
<RI> Input initialized.
<RI> Initialized touch support.
UnloadTime: 0.358878 ms
2019-02-05T20:41:51 0.004 INF [steamworks.NET] SteamAPI_Init() ok
2019-02-05T20:41:51 0.035 INF NET: InitCallbacks
2019-02-05T20:41:51 0.045 INF Texture quality is set to 0
2019-02-05T20:41:51 0.046 INF Precaching...
2019-02-05T20:41:51 0.046 INF Precaching file: 7DaysToDie_Data/resources.assets
2019-02-05T20:41:51 0.103 INF [EAC] Not loading, not started from launcher
2019-02-05T20:41:52 0.260 INF Precaching file: 7DaysToDie_Data/sharedassets1.assets
2019-02-05T20:41:52 0.271 INF Precaching file: Data/Bundles/blocktextureatlases
2019-02-05T20:41:52 0.618 INF Precaching file: Data/Bundles/terraintextures
2019-02-05T20:41:52 0.646 INF Precaching done
2019-02-05T20:41:54 2.213 INF Loading main scene
Unloading 6 Unused Serialized files (Serialized files now loaded: 0)
UnloadTime: 1.524896 ms
2019-02-05T20:41:54 2.308 INF Awake
2019-02-05T20:41:54 2.332 WRN Setting global culture failed!
Localization language: English
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug.bindings.h Line: 43)
2019-02-05T20:41:54 2.357 INF Version: Alpha 17.1 (b9) Compatibility Version: Alpha 17.1, Build: Windows 64 Bit
2019-02-05T20:41:54 2.357 INF System information:
2019-02-05T20:41:54 2.357 INF OS: Windows 7 (6.1.0) 64bit
2019-02-05T20:41:54 2.358 INF CPU: Intel® Core i5-7600K CPU @ 3.80GHz (cores: 4)
2019-02-05T20:41:54 2.358 INF RAM: 16326 MB
2019-02-05T20:41:54 2.358 INF GPU: NVIDIA GeForce GTX 1060 6GB (6030 MB)
2019-02-05T20:41:54 2.358 INF Graphics API: Direct3D 11.0 [level 11.0] (shader level 5.0)
2019-02-05T20:41:54 2.358 INF Last played version: Alpha 17.1
2019-02-05T20:41:54 2.358 INF Local UTC offset: -2 hours
2019-02-05T20:41:54 2.358 WRN Setting global culture failed!
2019-02-05T20:41:54 2.362 INF Command line arguments: C:\Jogos\Steam\steamapps\common\7 Days To Die\7DaysToDie.exe -force-d3d11 -logfile C:\Jogos\Steam\steamapps\common\7 Days To Die\7DaysToDie_Data\output_log__2019-02-05__20-41-50.txt
2019-02-05T20:41:54 2.364 INF Not running in Big Picture Mode, no on-screen keyboard available
2019-02-05T20:41:54 2.364 INF Starting PlayerInputManager...
2019-02-05T20:41:54 2.371 INF InControl (version 1.6.17 build 9143, native module = False, XInput = True)
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/XInputInterface32
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/.\XInputInterface32
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/XInputInterface32
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/libXInputInterface32
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/.\libXInputInterface32
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/libXInputInterface32
2019-02-05T20:41:54 2.430 INF Starting UserProfileManager...
2019-02-05T20:41:54 2.475 INF [MODS] No mods folder found
2019-02-05T20:41:54 2.482 INF Loading permissions file at 'C:\Users\Joaquim\AppData\Roaming/7DaysToDie/Saves/serveradmin.xml'
2019-02-05T20:41:54 2.515 INF Loading permissions file done.
2019-02-05T20:41:54 2.549 INF Awake done in 241 ms
2019-02-05T20:41:54 2.836 INF Atlas reset took 282 ms
2019-02-05T20:41:54 2.836 INF Atlas load took 286 ms
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/libc
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/.\libc
Fallback handler could not load library C:/Jogos/Steam/steamapps/common/7 Days To Die/7DaysToDie_Data/Mono/libc
Unloading 9 unused Assets to reduce memory usage. Loaded Objects now: 3915.
Total: 7.444096 ms (FindLiveObjects: 0.917854 ms CreateObjectMapping: 0.361308 ms MarkObjects: 6.106875 ms DeleteObjects: 0.057517 ms)
Unloading 1 Unused Serialized files (Serialized files now loaded: 1)
Unloading 13 unused Assets to reduce memory usage. Loaded Objects now: 3915.
Total: 5.162017 ms (FindLiveObjects: 0.730988 ms CreateObjectMapping: 0.112875 ms MarkObjects: 4.251994 ms DeleteObjects: 0.065348 ms)
Unloading 0 Unused Serialized files (Serialized files now loaded: 1)
Unloading 0 unused Assets to reduce memory usage. Loaded Objects now: 3915.
Total: 5.455817 ms (FindLiveObjects: 1.120921 ms CreateObjectMapping: 0.234121 ms MarkObjects: 4.096723 ms DeleteObjects: 0.003510 ms)
2019-02-05T20:41:54 3.055 INF User joined: apostrophejj
2019-02-05T20:41:55 3.230 INF Reloading serveradmin.xml
2019-02-05T20:41:55 3.230 INF Loading permissions file at 'C:\Users\Joaquim\AppData\Roaming/7DaysToDie/Saves/serveradmin.xml'
2019-02-05T20:41:55 3.230 INF Loading permissions file done.
UMA Overlay loading took 346 ms
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug.bindings.h Line: 43)
UMA Slot loading took 1 ms
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug.bindings.h Line: 43)
2019-02-05T20:41:56 4.631 WRN Failed loading world header file: C:\Users\Joaquim\AppData\Roaming\7DaysToDie\Saves\Zuhehi Territory\My Game/main.ttw
2019-02-05T20:41:56 4.631 INF Trying backup header: C:\Users\Joaquim\AppData\Roaming\7DaysToDie\Saves\Zuhehi Territory\My Game/main.ttw.bak
2019-02-05T20:41:56 4.631 ERR Failed loading backup header file!
2019-02-05T20:41:57 6.115 INF WorldStaticData.Init() needed 2.175s
2019-02-05T20:41:58 6.232 INF [steamworks.NET] Login ok.
2019-02-05T20:41:58 6.613 INF AchievementManager: Received stats and achievements from Steam
2019-02-05T20:41:59 7.925 WRN Failed loading world header file: C:\Users\Joaquim\AppData\Roaming\7DaysToDie\Saves\Zuhehi Territory\My Game/main.ttw
2019-02-05T20:41:59 7.925 INF Trying backup header: C:\Users\Joaquim\AppData\Roaming\7DaysToDie\Saves\Zuhehi Territory\My Game/main.ttw.bak
2019-02-05T20:41:59 7.925 ERR Failed loading backup header file!
NullReferenceException: Object reference not set to an instance of an object
at XUiC_NewContinueGame.GameModeChanged (.GameMode _newMode) [0x00000] in <filename unknown>:0
at XUiC_NewContinueGame.SavesList_OnSelectionChanged (.XUiC_ListEntry`1 _previousEntry, .XUiC_ListEntry`1 _newEntry) [0x00000] in <filename unknown>:0
at XUiC_List`1[T].OnSelectionChanged (.XUiC_ListEntry`1 _previousEntry, .XUiC_ListEntry`1 _newEntry) [0x00000] in <filename unknown>:0
at XUiC_List`1[T].set_SelectedEntry (.XUiC_ListEntry`1 value) [0x00000] in <filename unknown>:0
at XUiC_ListEntry`1[XUiC_SavegamesList+ListEntry].set_Selected (Boolean value) [0x00000] in <filename unknown>:0
at XUiC_ListEntry`1[XUiC_SavegamesList+ListEntry].XUiC_ListEntry_OnPress (.XUiController _sender, .OnPressEventArgs _e) [0x00000] in <filename unknown>:0
at XUiController.OnPressed (.OnPressEventArgs _e) [0x00000] in <filename unknown>:0
at XUiController.Pressed (Int32 mouseButton) [0x00000] in <filename unknown>:0
at XUiView.OnClick (UnityEngine.GameObject _go) [0x00000] in <filename unknown>:0
at UIEventListener.OnClick () [0x00000] in <filename unknown>:0
UnityEngine.GameObject:SendMessage(String, Object, SendMessageOptions)
UICamera:Notify(GameObject, String, Object)
UICamera

rocessTouch(Boolean, Boolean, Boolean)
UICamera

rocessMouse()
UICamera

rocessTouches()
UICamera:Update()
(Filename: Line: -1)
2019-02-05T20:42:04 12.902 INF OnApplicationQuit
2019-02-05T20:42:04 12.904 INF OnApplicationQuit
Setting up 2 worker threads for Enlighten.
Thread -> id: b70 -> priority: 1
Thread -> id: b34 -> priority: 1